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Text File  |  1990-03-09  |  154KB  |  3,088 lines
  1. .RR--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!
  2. .PL 62
  3. .LM 1
  4. .RM 78
  5. .MT3
  6. .MB4
  7. .HM1
  8. .FM1
  9. .PO10
  10. .CW10
  11. .SR2
  12. .UJ0
  13. .OJ0
  14. .UL1
  15. .aw off
  16. .heSequential-Access Devices                                               3/9/90
  17. .foSCSI-2 draft proposed American National Standard        9-#      Revision 10c
  18. .pn 1
  19. .cp 30
  20. .pm 0
  21. 9. Sequential-Access Devices
  22. .aw on
  23. .pm 3
  24.  
  25.  
  26. .cp 20
  27. .aw off
  28. .pm 0
  29. 9.1. Sequential-Acces≤ Devicσ Model
  30. .aw on
  31. .pm 3
  32.  
  33.  
  34. .cp 10
  35. .aw off
  36. .pm 0
  37. 9.1.1. Physical Elements
  38. .aw on
  39. .pm 3
  40.  
  41. .cp 4
  42. ááSequentia∞-acces≤ device≤ (calleΣ device≤ below⌐ optimizσ thei≥ usσ iε ì
  43. storinτ o≥ retrievinτ use≥ datß iε ß sequentia∞ manner«  Sincσ acces≤ i≤ ì
  44. sequential¼ positioε change≤ typicall∙ takσ ß lonτ time¼ wheε compareΣ t∩ ì
  45. direc⌠-acces≤ devices.
  46.  
  47. .cp 3
  48. ááSequentia∞-acces≤ device≤ arσ usuall∙ tapσ devices«  Thσ remainde≥ oµ thi≤ ì
  49. descriptioε i≤ froφ thσ poin⌠ oµ vie≈ oµ ß tapσ device╗ however¼ othe≥ ì
  50. implementation≤ arσ no⌠ precluded.
  51.  
  52. .cp 7
  53. ááThσ recordinτ mediuφ fo≥ tapσ device≤ consist≤ oµ variou≤ width≤ anΣ length≤ ì
  54. oµ ß flexiblσ substratσ coateΣ witΦ ß semΘ-permanen⌠ magnetiπ material«  Thσ ì
  55. recordinτ mediuφ ma∙ bσ wounΣ ont∩ singlσ reel≤ o≥ encapsulateΣ int∩ ì
  56. cartridge≤ containinτ botΦ ß suppl∙ ree∞ anΣ ß takσ-u≡ reel«  Severa∞ Americaε ì
  57. Nationa∞ Standard≤ exis⌠ coverinτ thσ constructioε oµ reel≤ anΣ cartridge≤ fo≥ ì
  58. interchangσ a≤ wel∞ a≤ recordinτ technique≤ fo≥ man∙ oµ thσ forma⌠ o≥ densit∙ ì
  59. combinations.
  60.  
  61. .cp 3
  62. áá┴ completσ uni⌠ composeΣ oµ thσ recordinτ mediuφ anΣ it≤ physica∞ carrie≥ ì
  63. (e.g.¼ reel¼ cartridge¼ cassette⌐ i≤ calleΣ ß volume«  Volume≤ havσ aε ì
  64. attributσ oµ beinτ mounteΣ o≥ demounteΣ oε ß suitablσ transpor⌠ mechanism«  
  65.  
  66. .cp 4
  67. ááMounteΣ i≤ thσ statσ oµ ß volumσ wheε thσ devicσ i≤ physicall∙ capablσ oµ ì
  68. executinτ command≤ tha⌠ causσ thσ thσ mediuφ t∩ bσ moved«  ┴ volumσ i≤ ì
  69. demounteΣ wheε i⌠ i≤ beinτ loaded¼ threaded¼ unloaded¼ unthreaded¼ o≥ wheε no⌠ ì
  70. attacheΣ t∩ thσ device«  
  71.  
  72. .cp 6
  73. ááRead∙ i≤ thσ statσ oµ thσ devicσ wheε mediuφ acces≤ anΣ noε-mediuφ acces≤ ì
  74. command≤ caε bσ executed«  Thσ devicσ i≤ no⌠ read∙ wheε n∩ volumσ i≤ mounteΣ ì
  75. or¼ froφ thσ initiator'≤ perspective¼ wheneve≥ al∞ mediuφ acces≤ command≤ ì
  76. repor⌠ CHEC╦ CONDITIO╬ statu≤ anΣ ß NO╘ READ┘ sensσ key«  Somσ device≤ ma∙ ì
  77. havσ ß separatσ switcΦ functioε whicΦ place≤ thσ devicσ iε ß no⌠ read∙ statσ ì
  78. eveε wheε ß volumσ i≤ mounted«  
  79.  
  80. .cp3
  81. ááThσ writσ enableΣ o≥ writσ protecteΣ statσ determine≤ wheε aε initiato≥ ma∙ ì
  82. writσ informatioε oε ß volume«  Thi≤ attributσ i≤ usuall∙ controlleΣ b∙ thσ ì
  83. use≥ oµ thσ volumσ througΦ manua∞ interventioε (e.g.¼ thumbwhee∞ switch).
  84.  
  85. .cp 5
  86. ááThσ recordinτ mediuφ ha≤ tw∩ physica∞ attribute≤ calleΣ beginninτ-oµ-mediuφ ì
  87. (BOM⌐ anΣ enΣ-oµ-mediuφ (EOM)«  Beginninτ-oµ-mediuφ i≤ a⌠ thσ enΣ oµ thσ ì
  88. mediuφ tha⌠ i≤ attacheΣ t∩ thσ takσ-u≡ reel«  EnΣ-oµ-mediuφ i≤ a⌠ thσ enΣ oµ ì
  89. thσ mediuφ tha⌠ i≤ attacheΣ t∩ thσ suppl∙ reel«  Iε somσ cases¼ thσ mediuφ i≤ ì
  90. permanentl∙ affixeΣ t∩ onσ o≥ botΦ oµ thσ ree∞ hubs.
  91.  
  92. .cp 5èááA≤ showε iε Figurσ ╣-1¼ thσ entirσ physica∞ lengtΦ oµ mediuφ i≤ no⌠ usablσ ì
  93. fo≥ recordinτ data« Fo≥ mos⌠ volumes¼ ß lengtΦ oµ thσ mediuφ i≤ reserveΣ ì
  94. beforσ thσ beginninτ-oµ-mediuφ anΣ afte≥ thσ enΣ-oµ-mediuφ position« Thi≤ i≤ ì
  95. donσ t∩ providσ sufficien⌠ tapσ wrap≤ ont∩ thσ ree∞ hub(s⌐ anΣ t∩ ensurσ tha⌠ ì
  96. recordinτ start≤ iε aε undamageΣ sectioε oµ thσ medium.
  97.  
  98. .aw off
  99. .pm 0
  100. .cp 10
  101.        BO═                                                          EOM
  102. ==============================================================================
  103.           ----------------------------------------------------------
  104.  Reserved ----------Usable-----------------------------------------¡ Reserved
  105.   Medium  --------------------------Recording----------------------¡  Medium
  106.    Area   --------------------------------------------Zone---------¡   Area
  107.           ----------------------------------------------------------
  108. ==============================================================================
  109. <¡-¡ Take-up Hub                                               Supply Hub --->
  110.  
  111.                       Figure 9-1: Typica∞ Volume Layout
  112.  
  113.  
  114. .aw off
  115. .pm 0
  116. .cp 10
  117. 9.1.2. Datß Storagσ Characteristics
  118. .pm 3
  119. .aw on
  120.  
  121. .cp 6
  122. ááThσ positioε oε thσ mediuφ wherσ ß patterε oµ recordeΣ signa∞ ma∙ bσ writteε ì
  123. b∙ onσ writσ componen⌠ i≤ calleΣ ß tracδ (Figurσ ╣-2)«  ┴ devicσ ma∙ writσ o≥ ì
  124. reaΣ froφ onσ o≥ morσ track≤ a⌠ ß time¼ dependinτ oε thσ format«  
  125.  
  126. .aw off
  127. .pm 0
  128. .cp 10
  129.        BO═                                                          EO═   
  130. ==============================================================================
  131. Tracδ 1   ---------------------------------------------------------- 
  132. Tracδ 2   ----------------------------------------------------------     
  133.   ::║     ---------------------------------------------------------¡     
  134. Tracδ n-▒ ----------------------------------------------------------
  135. Tracδ n   ----------------------------------------------------------
  136. ==============================================================================
  137.  
  138.                    Figure 9-2: Typica∞ Mediuφ Tracδ Layout
  139. .aw on
  140. .pm 3
  141.  
  142.  
  143. .cp 3
  144. ááOε ß ne≈ volume¼ recordinτ oµ onσ o≥ morσ track≤ begin≤ afte≥ mountinτ thσ ì
  145. volumσ anΣ movinτ froφ beginninτ-oµ-mediuφ towarΣ enΣ-oµ-medium« Thσ numbe≥ oµ ì
  146. track≤ writteε a⌠ onσ timσ i≤ calleΣ ß tracδ grou≡ (TrkGrp)«  Fo≥ recordeΣ ì
  147. volumes¼ readinτ iε thσ forwarΣ directioε follow≤ thσ samσ coursσ oµ track≤ a≤ ì
  148. wheε writing.
  149.  
  150. .cp 5
  151. ááIµ no⌠ al∞ track≤ arσ recordeΣ a⌠ thσ samσ time¼ anΣ thσ devicσ reverse≤ ì
  152. directioε wheε approachinτ enΣ-oµ-mediuφ anΣ begin≤ writinτ oε remaininτ ì
  153. tracks¼ thσ recordinτ methoΣ i≤ calleΣ serpentine« Fo≥ serpentinσ device≤ tha⌠ ì
  154. recorΣ onl∙ onσ tracδ a⌠ ß time¼ eacΦ physica∞ tracδ represent≤ onσ tracδ ì
  155. grou≡ (Figurσ ╣-3).
  156.  
  157. .aw off
  158. .pm 0
  159. .cp 10è        BO═                                                         EO═   
  160. ==============================================================================
  161.  Tracδ 1   --------------------------------------------------------> TrkGr≡ 1
  162.  Tracδ 2   <-------------------------------------------------------- TrδGr≡ 2
  163.    :║:     -------------------------------------------------------->   ::║  
  164.    ::║     <--------------------------------------------------------   ::║    
  165.  Tracδ n   --------------------------------------------------------¡ TrkGr≡ n
  166. ==============================================================================
  167.  
  168.                    Figure 9-3: Serpentinσ Recording Example 
  169.  
  170.  
  171. .aw on
  172. .pm 3
  173. .cp 14
  174. ááSomσ multΘ-tracδ device≤ havσ onl∙ onσ tracδ group¼ usinτ ß paralle∞ storagσ ì
  175. forma⌠ tha⌠ support≤ thσ simultaneou≤ recordinτ oµ al∞ availablσ track≤ ì
  176. (Figurσ ╣-4).
  177.  
  178. .aw off
  179. .pm 0
  180.         BO═                                                         EO═   
  181. ==============================================================================
  182.  Tracδ 1   --------------------------------------------------------╛\       
  183.  Tracδ 2   --------------------------------------------------------> \      
  184.    :║:     -------------------------------------------------------->  >TrkGrp1
  185.    ::║     --------------------------------------------------------╛ /        
  186.  Tracδ n   -------------------------------------------------------->/
  187. ==============================================================================
  188.  
  189.                     Figure 9-4: Paralle∞ Recording Example
  190.  
  191.  
  192. .aw on
  193. .pm 3
  194. .cp 4
  195. ááThσ serpentinσ anΣ paralle∞ recordinτ format≤ showε iε thσ previou≤ example≤ ì
  196. definσ track≤ a≤ longitudina∞ pattern≤ oµ recordeΣ information«  Onσ othe≥ ì
  197. storagσ forma⌠ useΣ b∙ somσ device≤ record≤ track≤ diagonall∙ acros≤ thσ ì
  198. medium«  Thi≤ recordinτ techniquσ i≤ knowε a≤ helica∞ scaε (Figurσ ╣-5).
  199.  
  200. .aw off
  201. .pm 0
  202. .cp 10
  203.                                                                          
  204. ==============================================================================
  205.         BOM    » » » » » » » » » » » » » » » » » » » » » » » / » »  EOM    
  206.               » » » » » » » » » » » » » » » » » » » » » » » » » »           
  207.              / » » » » » » » » » » » » » » » » » » » » » » » » /            
  208.             » » » » » » » » » » » » » » » » » » » » » » » » » /               
  209. Tracδ ▒ --╛» » » » » » » » » » » » » » » » » » » » » » » » » /<-¡ Tracδ n
  210. ==============================================================================
  211.   
  212.                   Figure 9-5: Helica∞ Scaε Recordinτ Example
  213.  
  214.  
  215. .aw on
  216. .pm 3
  217. .cp 4
  218. ááFo≥ mos⌠ recordinτ formats¼ aε areß a⌠ beginninτ-oµ-mediuφ contain≤ ß forma⌠ ì
  219. identificatioε iε thσ forφ oµ ß tonσ burs⌠ o≥ somσ othe≥ recognizablσ pattern«  ì
  220. Use≥ datß i≤ no⌠ recordeΣ iε thi≤ area«  Thσ forma⌠ identificatioε i≤ aε ì
  221. attributσ oµ ß volumσ useΣ fo≥ interchangσ purpose≤ anΣ i≤ defineΣ iε ì
  222. applicablσ standards« 
  223.  
  224. .cp 7èááWheε writing¼ thσ initiato≥ need≤ aε indicatioε tha⌠ i⌠ i≤ approachinτ thσ ì
  225. enΣ oµ thσ permissiblσ recordinτ area«  Thi≤ position¼ calleΣ earl∙-warninτ ì
  226. (EW)¼ i≤ typicall∙ reporteΣ t∩ thσ initiato≥ a⌠ ß positioε earl∙ enougΦ fo≥ ì
  227. thσ devicσ t∩ writσ an∙ buffereΣ datß t∩ thσ mediuφ whilσ stil∞ leavinτ enougΦ ì
  228. rooφ fo≥ additiona∞ recordeΣ label≤ o≥ filemarks«  Somσ Americaε Nationa∞ ì
  229. Standard≤ includσ physica∞ requirement≤ fo≥ ß marke≥ placeΣ oε thσ mediuφ t∩ ì
  230. bσ detecteΣ b∙ thσ devicσ a≤ earl∙-warninτ (Figurσ ╣-6).
  231.  
  232. .aw off
  233. .pm 0
  234. .cp 6
  235.                   BO═                           EW       EOM
  236.                   -------------------------------->-------->                                                 
  237.  
  238.                       Figure 9-6: Early-Warninτ Example
  239.  
  240.  
  241. .aw on
  242. .pm 3
  243. .cp 5
  244. ááFo≥ device≤ whicΦ implemen⌠ largσ datß buffers¼ thσ earl∙-warninτ positioε ì
  245. defineΣ b∙ ß physica∞ marke≥ ma∙ bσ to∩ closσ t∩ thσ enΣ oµ thσ recordinτ ì
  246. regioε t∩ permi⌠ emptyinτ thσ datß buffer(s)«  Fo≥ thesσ devices¼ ß logica∞ ì
  247. concep⌠ oµ earl∙-warninτ i≤ ofteε useΣ t∩ signa∞ thσ initiato≥ a⌠ aε ì
  248. appropriatσ locatioε prio≥ t∩ thσ physica∞ marker.
  249.  
  250.  
  251. .cp 10
  252. .aw off
  253. .pm 0
  254. 9.1.3. Partitions within a Volume
  255. .aw on
  256. .pm 3
  257.  
  258. .cp 5
  259. ááAnothe≥ attributσ oµ ß volumσ i≤ calleΣ ß partition«  Partition≤ consis⌠ oµ ì
  260. onσ o≥ morσ noε-overlappeΣ minΘ-volumes¼ eacΦ witΦ it≤ owε beginninτ anΣ ì
  261. endinτ points¼ occupyinτ ß singlσ physica∞ volume«  EacΦ partitioε (x⌐ withiε ì
  262. ß volumσ ha≤ ß defineΣ beginninτ-oµ-partitioε (BO╨ x)¼ aε earl∙-warninτ ì
  263. positioε (E╫ x)¼ anΣ aε enΣ-oµ-partitioε (EO╨ x)«  
  264.  
  265. .cp 4
  266. ááAl∞ volume≤ havσ ß minimuφ oµ onσ partitioε calleΣ partitioε zero¼ thσ ì
  267. defaul⌠ datß partition«  Fo≥ device≤ whicΦ suppor⌠ onl∙ onσ partition¼ thσ ì
  268. beginninτ-oµ-partitioε zer∩ (BO╨ 0⌐ ma∙ bσ equivalen⌠ t∩ thσ beginninτ-oµ-ì
  269. mediuφ anΣ thσ enΣ-oµ-partitioε zer∩ (EO╨ 0⌐ ma∙ bσ equivalen⌠ t∩ thσ enΣ-oµ-ì
  270. medium.
  271.  
  272. .cp 3
  273. ááWheε ß volumσ i≤ mounted¼ i⌠ i≤ logicall∙ positioneΣ t∩ beginninτ oµ thσ ì
  274. defaul⌠ datß partitioε (BO╨ 0)«  Wheε ß REWIN─ commanΣ i≤ receiveΣ iε an∙ ì
  275. partitioε (x)¼ thσ devicσ position≤ t∩ thσ beginninτ-oµ-partitioε (BO╨ x).
  276.  
  277. .cp 7
  278. áá Partition≤ oε ß volumσ d∩ no⌠ neeΣ t∩ bσ recordeΣ iε an∙ defineΣ order¼ no≥ ì
  279. d∩ al∞ partitioε number≤ iε ß sequencσ neeΣ t∩ bσ presen⌠ oε ß volume«  I⌠ i≤ ì
  280. sufficien⌠ fo≥ ß devicσ t∩ bσ ablσ t∩ locatσ ß partition¼ giveε it≤ codσ ì
  281. value¼ o≥ determinσ tha⌠ i⌠ doe≤ no⌠ exis⌠ oε thσ volume«  Fo≥ interchange¼ ì
  282. informatioε abou⌠ whicΦ partition≤ arσ presen⌠ oε ß volumσ ma∙ bσ storeΣ oε ì
  283. thσ volumσ iε ß devicσ-defineΣ areß (possibl∙ unavailablσ t∩ thσ initiator⌐ o≥ ì
  284. thσ informatioε ma∙ bσ aε intrinsiπ attributσ oµ thσ devicσ implementation«  
  285.  
  286. .cp 14èááFigurσ ╣-╖ show≤ ß possiblσ partitioε implementatioε fo≥ ß fou≥-tracδ ì
  287. serpentinσ recordinτ device¼ assuminτ tha⌠ eacΦ tracδ grou≡ define≤ ß ì
  288. partition.
  289.  
  290. .aw off
  291. .pm 0
  292.          BO═                                                            EO═   
  293. ==============================================================================
  294. TrkGrp▒  BOP░ ----------------------------------------------->EW0-----╛ EOP0 
  295. TrkGrp▓  EOP▒ <-----EW1<----------------------------------------------¡ BOP1 
  296. TrkGrp│  BOP▓ ----------------------------------------------->EW2-----╛ EOP2
  297. TrkGrp┤  EOP│ <-----EW3<----------------------------------------------¡ BOP3 
  298. ==============================================================================
  299.  
  300.        Figure 9-7: Partitioninτ Example - One Partition per Track Group
  301.  
  302.  
  303. .aw on
  304. .pm 3
  305. .cp 3
  306. ááAnothe≥ possiblσ partitioε implementatioε fo≥ thi≤ fou≥-tracδ serpentinσ ì
  307. recordinτ devicσ i≤ showε iε Figurσ ╣-8¼ usinτ tw∩ tracδ group≤ t∩ definσ eacΦ ì
  308. partition.
  309.  
  310. .aw off
  311. .pm 0
  312. .cp 10
  313.          BO═                                                            EO═   
  314. ==============================================================================
  315. TrkGrp▒  BOP░ --------------------------------------------------------╛      
  316. TrkGrp▓  EOP0 <-----EW0<----------------------------------------------¡      
  317. TrkGrp│  BOP1 --------------------------------------------------------╛     
  318. TrkGrp┤  EOP1 <-----EW1<----------------------------------------------¡      
  319. ==============================================================================
  320.  
  321.     Figure 9-8: Partitioninτ Example - One Partition per Tw∩ Track Groups
  322.  
  323.  
  324. .aw on
  325. .pm 3
  326. .cp 7
  327. ááThσ previou≤ example≤ sho≈ thσ beginninτ anΣ endinτ point≤ fo≥ ß partitioε ì
  328. aligneΣ witΦ physica∞ bound≤ oµ thσ medium«  Thi≤ i≤ no⌠ ß mandator∙ ì
  329. requiremen⌠ fo≥ partitioning╗ i⌠ i≤ sufficien⌠ fo≥ ß devicσ t∩ bσ ablσ t∩ ì
  330. locatσ t∩ anΣ sta∙ iε an∙ partitioε boundeΣ b∙ ß BO╨ ° anΣ EO╨ x«  Iε thi≤ ì
  331. case¼ ß recordeΣ marδ o≥ somσ othe≥ devicσ-recognizablσ attributσ coulΣ bσ ì
  332. useΣ t∩ delineatσ thσ partitions«  Figurσ ╣-╣ show≤ ß possiblσ tw∩-partitioε ì
  333. implementatioε fo≥ ß devicσ witΦ onl∙ onσ tracδ group.
  334.  
  335. .aw off
  336. .pm 0
  337. .cp 10
  338.          BO═                                                            EO═   
  339. ==============================================================================
  340.               --------->------->----------------------------->--------╛      
  341.               --------->--¡---->----------------------------->--------╛      
  342. TrkGrp1  BOP0 --------->EW0---->EOP0/BOP1-------------------->EW1-----╛ EOP1 
  343.               --------->------->----------------------------->--------╛      
  344.               --------->------->----------------------------->--------╛      
  345. ==============================================================================
  346.  
  347.       Figure 9-9: Partitioninτ Example - Two Partitions per Track Group
  348.  
  349.  
  350. .aw on
  351. .pm 3
  352. .cp 8èááThreσ method≤ arσ defineΣ iε thσ MOD┼ SENS┼ anΣ MOD┼ SELEC╘ command≤ fo≥ ì
  353. managinτ partitions╗ eacΦ methoΣ i≤ progressivel∙ morσ difficul⌠ t∩ implemen⌠ ì
  354. anΣ manage║ 
  355.  
  356. áá(1⌐ devicσ-defineΣ fixeΣ locations;
  357. áá(2⌐ devicσ-defineΣ baseΣ oε aε initiato≥ supplieΣ numbe≥ oµ partition≤ anΣ ß ì
  358. devicσ specifiπ allocatioε algorithm╗ and,
  359. áá(3⌐ definitioε b∙ namσ anΣ capacit∙ b∙ aε initiator.
  360.  
  361.  
  362. .cp 7
  363. .aw off
  364. .pm 0
  365. 9.1.4. Logical Elements within a Partition
  366. .aw on
  367. .pm 3
  368.  
  369. ááThσ areß betweeε BO╨ ° anΣ EO╨ ° oε ß typica∞ recordeΣ volumσ contain≤ a⌠ ì
  370. leas⌠ tw∩ type≤ oµ initiato≥ accessiblσ elements¼ datß block≤ anΣ tapσ marks«  ì
  371. Thesσ element≤ arσ controlleΣ anΣ transferreΣ betweeε thσ initiato≥ anΣ thσ ì
  372. mediuφ usinτ READ¼ REA─ REVERSE¼ WRITE¼ anΣ WRIT┼ FILEMARK╙ commands.
  373.  
  374. .cp 7
  375. áá┴ uni⌠ oµ datß supplieΣ o≥ requesteΣ b∙ aε initiato≥ i≤ calleΣ ß logica∞ ì
  376. block«  Logica∞ block≤ arσ storeΣ accordinτ t∩ thσ specification≤ oµ thσ ì
  377. forma⌠ fo≥ thσ volumσ anΣ ma∙ bσ recordeΣ a≤ onσ o≥ morσ physica∞ block≤ oε ì
  378. thσ medium«  Wheε thσ physica∞ blocδ anΣ thσ logica∞ blocδ arσ no⌠ recordeΣ iε ì
  379. ß onσ-t∩-onσ relationship¼ i⌠ i≤ thσ responsibilit∙ oµ thσ devicσ t∩ perforφ ì
  380. al∞ blocking¼ dσ-blocking¼ padding¼ stripping¼ splittinτ o≥ rebuildinτ oµ thσ ì
  381. logica∞ datß block(s⌐ sen⌠ b∙ aε initiator«  
  382.  
  383. .cp 9
  384. ááFilemark≤ arσ specia∞ recordeΣ element≤ containinτ n∩ use≥ data«  Thσ ì
  385. filemarδ forma⌠ i≤ defineΣ iε somσ Americaε Nationa∞ Standards«  Initiator≤ ì
  386. traditionall∙ usσ filemark≤ t∩ separatσ use≥ datß froφ label≤ anΣ logica∞ ì
  387. grouping≤ oµ datß froφ eacΦ other«  Sincσ somσ forma⌠ standard≤ d∩ no⌠ definσ ì
  388. aε explici⌠ enΣ-oµ-datß (EOD)¼ hos⌠ softwarσ ha≤ ofteε useΣ convention≤ witΦ ì
  389. filemark≤ t∩ represen⌠ aε EO─ indication«  A⌠ leas⌠ onσ Americaε Nationa∞ ì
  390. StandarΣ specificall∙ define≤ filemarδ usσ fo≥ thi≤ purpose«  Iε somσ ì
  391. implementations¼ thσ device'≤ EO─ definitioε ma∙ bσ specifieΣ thσ initiato≥ ì
  392. usinτ thσ MOD┼ SELEC╘ command.
  393.  
  394. .cp 7
  395. áá┴ setmarδ i≤ anothe≥ typσ oµ specia∞ recordeΣ elemen⌠ containinτ n∩ use≥ ì
  396. data¼ providinτ ß segmentatioε schemσ hierarchicall∙ superio≥ t∩ filemarks« ì
  397. Thi≤ leve∞ oµ segmentatioε i≤ usefu∞ fo≥ somσ higΦ capacit∙ storagσ device≤ t∩ ì
  398. providσ concisσ addressinτ anΣ fas⌠ positioninτ t∩ specifiπ set≤ oµ datß ì
  399. withiε ß partition«  Iε somσ implementations¼ thσ detectioε anΣ reportinτ oµ ì
  400. setmark≤ ma∙ bσ controlleΣ b∙ thσ initiato≥ usinτ thσ MOD┼ SELEC╘ command.
  401.  
  402. .cp 6
  403. ááInte≥-blocδ gaps¼ thσ gap≤ betweeε blocks¼ filemarks¼ anΣ setmarks¼ arσ ì
  404. introduceΣ oε thσ mediuφ a⌠ thσ timσ ß blocδ o≥ marδ i≤ writteε withou⌠ ì
  405. explici⌠ actioε b∙ thσ initiator«  Minimuφ anΣ maximuφ length≤ fo≥ inte≥-blocδ ì
  406. gap≤ arσ defineΣ iε somσ Americaε Nationa∞ Standards«  Iε somσ devices¼ thσ ì
  407. lengtΦ oµ inte≥-blocδ gap≤ ma∙ bσ selecteΣ b∙ thσ initiato≥ usinτ thσ MOD┼ ì
  408. SELEC╘ commanΣ whilσ iε othe≥ device≤ thσ gap≤ arσ fixeΣ anΣ noε-changeable«  
  409.  
  410. .cp 8èááIε additioε t∩ blocks¼ filemarks¼ anΣ setmarks¼ erasσ gap≤ ma∙ bσ recordeΣ ì
  411. oε thσ mediuφ througΦ usσ oµ thσ ERAS┼ commanΣ o≥ devicσ-initiateΣ erro≥ ì
  412. recover∙ actions«  AlthougΦ explicitl∙ recordeΣ oε thσ medium¼ therσ i≤ ì
  413. normall∙ n∩ distinctioε betweeε tw∩ contiguou≤ erasσ gaps«  Aε erasσ ga≡ ma∙ ì
  414. bσ ß lengtΦ oµ eraseΣ mediuφ o≥ ß recordeΣ patterε no⌠ distinguishablσ a≤ ß ì
  415. blocδ o≥ mark«  Minimuφ anΣ maximuφ length≤ fo≥ erasσ gap≤ arσ defineΣ iε somσ ì
  416. Americaε Nationa∞ Standard≤ whilσ somσ device≤ ma∙ havσ n∩ implementatioε oµ ì
  417. aε erasσ gap«  
  418.  
  419. .cp8
  420. ááAfte≥ writinτ datß froφ BO╨ x¼ thσ mediuφ i≤ considereΣ t∩ bσ ß contiguou≤ ì
  421. groupinτ oµ blocks¼ filemarks¼ setmarks¼ anΣ gaps«  Certaiε Americaε Nationa∞ ì
  422. Standard≤ definσ ga≡ length≤ which¼ iµ exceeded¼ arσ t∩ bσ considereΣ a≤ ì
  423. havinτ reacheΣ blanδ medium«  Dependinτ oε thσ format¼ thi≤ blanδ mediuφ ma∙ ì
  424. bσ treateΣ a≤ aε enΣ-oµ-datß indication¼ aε erro≥ recover∙ area¼ o≥ aε ì
  425. unrecoverablσ mediuφ erro≥ causinτ aε interchangσ error«  UnrecordeΣ volume≤ ì
  426. (ne≈ o≥ erased⌐ ma∙ exhibi⌠ blanδ mediuφ characteristic≤ iµ aε attemp⌠ i≤ madσ ì
  427. t∩ reaΣ o≥ spacσ thσ volumσ beforσ datß ha≤ beeε written«  
  428.  
  429. .cp 8
  430. áá┴ sequentia∞-acces≤ devicσ ma∙ bσ capablσ oµ supportinτ fixeΣ o≥ variablσ ì
  431. lengtΦ blocks«  Thσ concep⌠ oµ fixeΣ o≥ variablσ modσ fo≥ writinτ anΣ readinτ ì
  432. block≤ onl∙ indicate≤ thσ methoΣ b∙ whicΦ thσ initiato≥ specifie≤ thσ sizσ oµ ì
  433. ß logica∞ blocδ fo≥ transfe≥ anΣ no⌠ thσ methoΣ oµ recordinτ physica∞ block≤ ì
  434. oε thσ medium«  However¼ ß devicσ tha⌠ support≤ onl∙ fixeΣ-lengtΦ physica∞ ì
  435. block≤ ma∙ onl∙ bσ capablσ oµ supportinτ logica∞ block≤ oµ thσ samσ length«  ì
  436. Thσ lengtΦ oµ ß logica∞ blocδ i≤ alway≤ describeΣ iε bytes«  Thσ lengtΦ oµ ß ì
  437. physica∞ blocδ ma∙ o≥ ma∙ no⌠ bσ recordeΣ a≤ aε exac⌠ bytσ count¼ dependinτ oε ì
  438. thσ format.
  439.  
  440.  
  441. .cp 7
  442. .aw off
  443. .pm 0
  444. 9.1.5. Data Buffering
  445. .aw on
  446. .pm 3
  447.  
  448. áá┴ devicσ ma∙ contaiε ß temporar∙ storagσ areß capablσ oµ holdinτ onσ o≥ morσ ì
  449. logica∞ block≤ ¡ ß datß buffer«  ┴ devicσ datß buffe≥ ma∙ includσ an∙ ì
  450. combinatioε oµ blocks¼ filemarks¼ anΣ setmark≤ iε thσ proces≤ oµ beinτ writteε ì
  451. t∩ thσ medium¼ o≥ i⌠ ma∙ contaiε reaΣ-aheaΣ datß block≤ transferreΣ froφ thσ ì
  452. medium.
  453.  
  454. .cp 5
  455. áá┴ devicσ witΦ ß datß buffe≥ ma∙ bσ capablσ oµ operatinτ iε eithe≥ ß buffereΣ ì
  456. modσ o≥ aε unbuffereΣ mode«  ┴ devicσ witΦ n∩ datß buffe≥ operate≤ onl∙ iε ì
  457. unbuffereΣ mode«  Eithe≥ terφ i≤ onl∙ applicablσ t∩ thσ manne≥ iε whicΦ thσ ì
  458. devicσ manage≤ informatioε t∩ bσ writteε t∩ thσ medium« BuffereΣ modσ i≤ no⌠ ì
  459. applicablσ durinτ reaΣ commands¼ regardles≤ oµ whethe≥ reaΣ datß ≡ asse≤ ì
  460. througΦ ß datß buffer.
  461.  
  462. .cp 5
  463. áá┴ devicσ operatinτ iε buffereΣ modσ ma∙ returε GOO─ statu≤ fo≥ writσ ì
  464. operation≤ wheε al∞ writσ datß ha≤ beeε successfull∙ transferreΣ froφ thσ ì
  465. initiato≥ int∩ thσ devicσ datß buffer«  Fo≥ device≤ operatinτ iε unbuffereΣ ì
  466. mode¼ GOO─ statu≤ i≤ no⌠ returneΣ unti∞ al∞ requesteΣ data¼ filemarks¼ o≥ ì
  467. setmark≤ arσ successfull∙ recordeΣ oε thσ medium.
  468.  
  469. .cp 9èááWheε issuinτ ß buffereΣ WRIT┼ FILEMARK╙ commanΣ witΦ thσ immediatσ bi⌠ se⌠ ì
  470. t∩ one¼ GOO─ statu≤ i≤ returneΣ a≤ sooε a≤ thσ commanΣ i≤ validated«  ┴ WRIT┼ ì
  471. FILEMARK╙ commanΣ witΦ thσ immediatσ bi⌠ se⌠ t∩ zer∩ cause≤ an∙ buffereΣ ì
  472. blocks¼ filemarks¼ anΣ setmark≤ t∩ bσ writteε t∩ thσ medium«  Upoε successfu∞ ì
  473. completioε oµ thi≤ process¼ whicΦ i≤ calleΣ ß synchronizσ operation¼ n∩ ì
  474. blocks¼ filemarks¼ o≥ setmark≤ remaiε iε thσ datß buffe≥ whicΦ havσ no⌠ beeε ì
  475. writteε t∩ thσ medium«  ┴ synchronizσ operatioε ha≤ n∩ effec⌠ oε ß datß buffe≥ ì
  476. whicΦ contain≤ onl∙ reaΣ-aheaΣ datß o≥ writσ datß whicΦ ha≤ alread∙ beeε ì
  477. successfull∙ writteε t∩ thσ medium.
  478.  
  479. .cp 6
  480. ááShoulΣ aε unrecoverablσ writσ erro≥ occu≥ whilσ iε buffereΣ mode¼ thσ devicσ ì
  481. generate≤ aε erro≥ conditioε t∩ thσ curren⌠ activσ command«  Iµ n∩ commanΣ i≤ ì
  482. active¼ thσ erro≥ ma∙ bσ reporteΣ oε thσ nex⌠ applicablσ operatioε a≤ ß ì
  483. deferreΣ erro≥ (seσ 7.2.14.2)«  Fo≥ somσ implementations¼ asynchronou≤ even⌠ ì
  484. notificatioε (AEN⌐ o≥ extendeΣ contingen⌠ allegiancσ (ECA⌐ ma∙ bσ required«  ì
  485. Refe≥ t∩ 6.5.╡ anΣ 6.╖ fo≥ description≤ oµ AE╬ anΣ EC┴ protocol.
  486.  
  487. .cp 3
  488. ááThσ REA─ POSITIO╬ commanΣ ma∙ bσ useΣ t∩ determinσ thσ numbe≥ anΣ storagσ ì
  489. spacσ oµ buffereΣ block≤ no⌠ writteε beforσ thσ unrecoverablσ erro≥ wa≤ ì
  490. encountered.
  491.  
  492. .cp 3
  493. áá ┴ devicσ witΦ reaΣ-aheaΣ datß block≤ iε thσ datß buffe≥ doe≤ no⌠ repor⌠ aε ì
  494. unrecovereΣ reaΣ erro≥ unti∞ thσ datß blocδ iε erro≥ i≤ requesteΣ b∙ aε ì
  495. initiator.
  496.  
  497.  
  498. .cp 8
  499. .aw off
  500. .pm 0
  501. 9.1.6. Recorded Object Descriptors (Block Identifiers)
  502. .aw on
  503. .pm 3
  504.  
  505. ááSomσ recordinτ format≤ specif∙ tha⌠ recordeΣ object≤ (blocks¼ filemarks¼ anΣ ì
  506. setmarks⌐ havσ identifier≤ includeΣ iε thσ recordeΣ informatioε t∩ hel≡ ì
  507. determinσ writσ sequencσ anΣ als∩ t∩ hel≡ detec⌠ devicσ positioninτ errors«  ì
  508. Thσ identifie≥ value≤ arσ uniquσ withiε ß partitioε anΣ ma∙ bσ uniquσ withiε ß ì
  509. volume.
  510.  
  511. .cp 3
  512. ááThσ usσ oµ thσ terφ blocδ identifie≥ ma∙ impl∙ somσ arithmetiπ sequencσ ì
  513. applieΣ t∩ thσ assignmen⌠ oµ recordeΣ objects«  Thσ blocδ identifie≥ ì
  514. assignmen⌠ algorithφ ma∙ bσ defineΣ iε aε applicablσ forma⌠ standard.
  515.  
  516. .cp 4
  517. ááFo≥ somσ prσ-formatteΣ volumes¼ thσ identifier≤ arσ associateΣ witΦ physica∞ ì
  518. blocks«  Iε variablσ-lengtΦ implementations¼ thσ identifie≥ caε bσ associateΣ ì
  519. witΦ ß physica∞ blocδ wheε thσ logica∞ blocδ anΣ thσ physica∞ blocδ havσ ß ì
  520. onσ-t∩-onσ relationshi≡ oε thσ medium«  
  521.  
  522. .cp 7
  523. ááSomσ format≤ ma∙ carr∙ botΦ physica∞ anΣ logica∞ blocδ identifier≤ recordeΣ ì
  524. oε thσ medium«  Wheε ß logica∞ blocδ i≤ spli⌠ ove≥ morσ thaε onσ physica∞ ì
  525. block¼ o≥ multiplσ logica∞ block≤ arσ concatenateΣ t∩ forφ ß physica∞ block¼ ì
  526. thσ logica∞ blocδ identifie≥ anΣ thσ physica∞ blocδ identifie≥ arσ no⌠ thσ ì
  527. same«  Filemark≤ anΣ setmark≤ ma∙ o≥ ma∙ no⌠ havσ recordeΣ identifiers¼ bu⌠ iµ ì
  528. identifier≤ arσ useΣ iε thσ format¼ theε eacΦ marδ i≤ assigneΣ ß valuσ eveε iµ ì
  529. i⌠ i≤ no⌠ explicitl∙ recorded.
  530.  
  531. .cp 8èááThσ REA─ POSITIO╬ anΣ LOCAT┼ command≤ usσ fou≥-bytσ field≤ t∩ holΣ thesσ ì
  532. forma⌠ dependen⌠ identifiers«  Fo≥ somσ implementations¼ thi≤ valuσ ma∙ ì
  533. corresponΣ t∩ ß rea∞ physica∞ location╗ however¼ i⌠ i≤ sufficien⌠ fo≥ thσ ì
  534. devicσ t∩ ma≡ thσ identifie≥ t∩ ß valuσ representinτ thσ uniquσ recordeΣ ì
  535. object«  WitΦ thi≤ capability¼ thσ REA─ POSITIO╬ commanΣ ma∙ bσ useΣ t∩ repor⌠ ì
  536. ß devicσ-defineΣ blocδ identifie≥ anΣ thσ initiato≥ ma∙ usσ thi≤ valuσ witΦ ß ì
  537. LOCAT┼ commanΣ t∩ positioε t∩ thσ samσ locatioε a⌠ somσ futurσ timσ (provideΣ ì
  538. thσ volumσ ha≤ no⌠ beeε rewritteε iε thσ interim)«  
  539.  
  540.  
  541. .cp 12
  542. .aw off
  543. .pm 0
  544. 9.1.7. Direction and Position Definitions
  545. .aw on
  546. .pm 3
  547.  
  548. ááFo≥ sequentia∞-acces≤ devices¼ positioninτ ha≤ thσ connotatioε oµ logicall∙ ì
  549. beinτ in¼ at¼ before¼ o≥ afte≥ somσ defineΣ placσ withiε ß volume«  Thi≤ ì
  550. definitioε mean≤ thσ positioε i≤ capablσ oµ beinτ repeateΣ unde≥ thσ samσ ì
  551. circumstances«  Thσ orientatioε oµ usagσ fo≥ thσ fou≥ word≤ (in¼ at¼ before¼ ì
  552. o≥ after⌐ i≤ iε onσ direction¼ froφ BO╨ ° towarΣ EO╨ x«  Al∞ positioninτ ì
  553. defineΣ belo≈ i≤ wordeΣ froφ thi≤ perspective«  Device≤ withou⌠ buffer≤ havσ ì
  554. somσ physica∞ positioε whicΦ relate≤ t∩ thesσ logica∞ positions«  However¼ ì
  555. thesσ definition≤ d∩ no⌠ requirσ thσ mediuφ t∩ havσ ß physica∞ positioε ì
  556. equivalen⌠ t∩ thσ logica∞ positioε unles≤ explicitl∙ stated«  
  557.  
  558. .cp 4
  559. ááThσ forwarΣ directioε i≤ defineΣ a≤ logicall∙ progressinτ froφ BO╨ ° towarΣ ì
  560. EO╨ x« Thσ reversσ directioε i≤ defineΣ a≤ logicall∙ progressinτ froφ EO╨ ° ì
  561. towarΣ BO╨ x«  Iε serpentinσ devices¼ thσ logica∞ forwarΣ o≥ reversσ directioε ì
  562. ha≤ aε alternatinτ relationshi≡ t∩ thσ physica∞ motioε oµ thσ medium«  
  563.  
  564. .cp 6
  565. ááThσ concep⌠ oµ beinτ "inó somσ positioε mean≤ no⌠ beinτ outsidσ ß defineΣ ì
  566. region«  Thσ definitioε allow≤ thσ positioε t∩ bσ oε thσ boundar∙ oµ ß defineΣ ì
  567. region«  Wheε ß volumσ i≤ firs⌠ mounted¼ thσ logica∞ positioε i≤ alway≤ a⌠ thσ ì
  568. beginninτ oµ thσ defaul⌠ datß partitioε (BOP0)«  Wheneve≥ ß volumσ i≤ mounteΣ ì
  569. anΣ thσ mediuφ motioε i≤ stopped¼ thσ positioε i≤ iε somσ partition«  Whilσ ì
  570. movinτ betweeε partitions¼ therσ i≤ n∩ stablσ position«  
  571.  
  572. .cp 4
  573. ááThσ concep⌠ oµ beinτ "ató somσ positioε indicate≤ beinτ positioneΣ t∩ ß ì
  574. logica∞ o≥ physica∞ extremit∙ oµ ß partition«  ┴ sequentia∞-acces≤ devicσ ma∙ ì
  575. bσ positioneΣ a⌠ beginninτ-oµ-medium¼ a⌠ BO╨ x¼ a⌠ enΣ-oµ-datß (EOD)¼ a⌠ EO╨ ì
  576. x¼ o≥ a⌠ enΣ-oµ-mediuφ (EOM)¼ sincσ thesσ arσ stablσ position≤ a⌠ extremitie≤ ì
  577. oµ ß partition«  
  578.  
  579. .cp 8
  580. ááThσ concep⌠ oµ beinτ "beforeó somσ positioε indicate≤ tha⌠ therσ i≤ somσ ì
  581. elemen⌠ (datß block¼ filemark¼ setmark¼ o≥ othe≥ defineΣ point⌐ whicΦ ma∙ bσ ì
  582. encountereΣ wheε movinτ towarΣ EO╨ x¼ iµ thσ prope≥ command≤ arσ issued«  ì
  583. Beinτ positioneΣ beforσ ß particula≥ datß blocδ mean≤ tha⌠ iµ thσ devicσ ì
  584. receive≤ ß valiΣ REA─ command¼ thσ datß blocδ i≤ transferreΣ t∩ thσ initiator«  ì
  585. Thi≤ positioε ma∙ als∩ bσ beforσ E╫ ° anΣ EO╨ x¼ sincσ thesσ arσ defineΣ ì
  586. point≤ withiε an∙ partition«  However¼ iµ datß ha≤ no⌠ beeε writteε t∩ thσ ì
  587. enΣ-oµ-partition¼ thesσ point≤ ma∙ no⌠ bσ accessiblσ b∙ thσ initiator.
  588.  
  589. .cp 5
  590. ááThσ concep⌠ oµ beinτ "afteró somσ positioε indicate≤ tha⌠ therσ i≤ somσ ì
  591. elemen⌠ (datß block¼ filemark¼ setmark¼ o≥ othe≥ defineΣ point⌐ oε thσ BO╨ ° ì
  592. sidσ oµ thσ curren⌠ positioε whicΦ ma∙ bσ encountereΣ iµ thσ prope≥ command≤ ì
  593. arσ issued«  Wheε ß REA─ commanΣ fo≥ ß singlσ datß blocδ ha≤ beeε successfull∙ ì
  594. executed¼ thσ logica∞ positioε i≤ afte≥ thσ transferreΣ datß block.
  595. è.cp 8
  596. .aw off
  597. .pm 0
  598. 9.1.8. Erro≥ Reporting
  599. .aw on
  600. .pm 3
  601. .cp 4
  602.  
  603. ááIµ an∙ oµ thσ followinτ condition≤ occu≥ durinτ thσ executioε oµ ß commanΣ ì
  604. thσ targe⌠ shal∞ returε CHEC╦ CONDITIO╬ status«  Thσ appropriatσ sensσ ke∙ anΣ ì
  605. additiona∞ sensσ codσ shoulΣ bσ set«  Thσ followinτ tablσ illustrate≤ somσ ì
  606. erro≥ condition≤ anΣ thσ applicablσ sensσ keys«  Thσ tablσ doe≤ no⌠ providσ aε ì
  607. exhaustivσ enumeratioε oµ al∞ condition≤ tha⌠ ma∙ causσ thσ CHEC╦ CONDITIO╬ ì
  608. status.
  609.  
  610. .cp 25
  611. .pm 0
  612. .aw off
  613. Conditioε                                              Sensσ Ke∙ 
  614. ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡   ¡¡¡¡¡¡¡¡¡¡¡¡¡¡-
  615. Invalid logical block address                          ILLEGAL REQUEST
  616.  
  617. UnsupporteΣ optioε requesteΣ                           ILLEGA╠ REQUEST
  618.  
  619. Target reset or medium change since
  620. last command from this initiator                       UNIT ATTENTION
  621.  
  622. Selµ diagnostiπ faileΣ                                 HARDWAR┼ ERROR
  623.  
  624. Unrecovered read error                                 MEDIUM ERROR
  625.                                                        HARDWAR┼ ERROR
  626.  
  627. Recovered read o≥ writσ error                          RECOVERED ERROR
  628.  
  629. Overrun or other error that might
  630. be resolved by repeating the command                   ABORTED COMMAND
  631.  
  632. Attemp⌠ ß WRITE¼ READ¼ REA─ REVERSE¼ VERIFY¼ o≥        ILLEGA╠ REQUEST
  633. RECOVE╥ BUFFERE─ DAT┴ commanΣ witΦ thσ fixeΣ bi⌠ 
  634. se⌠ t∩ zer∩ anΣ variablσ blocδ modσ i≤ no⌠ supported
  635.  
  636. Attemp⌠ ß WRITE¼ READ¼ REA─ REVERSE¼ VERIFY¼ o≥        ILLEGA╠ REQUEST
  637. RECOVE╥ BUFFERE─ DAT┴ commanΣ witΦ ß fixeΣ bi⌠ oµ 
  638. zer∩ anΣ requesteΣ blocδ lengtΦ i≤ no⌠ supported
  639.  
  640. Attemp⌠ ß WRITE¼ READ¼ REA─ REVERSE¼ VERIFY¼ o≥        ILLEGA╠ REQUEST
  641. RECOVE╥ BUFFERE─ DAT┴ commanΣ witΦ ß fixeΣ bi⌠ oµ 
  642. one anΣ MOD┼ SENS┼ blocδ lengtΦ se⌠ t∩ zero
  643.  
  644. Attemp⌠ t∩ executσ aε erasσ o≥ writσ-typσ operatioε    DAT┴ PROTEC╘ 
  645. oε writσ protecteΣ medium
  646.  
  647. DeferreΣ writσ erro≥                                   MEDIU═ ERROR
  648.                                                        VOLUM┼ OVERFLOW
  649. .aw on
  650. .pm 3
  651.  
  652. .cp 3
  653. ááIε thσ casσ oµ aε unrecovereΣ reaΣ o≥ writσ error¼ iµ thσ reaΣ-writσ erro≥ ì
  654. recover∙ pagσ (9.3.3.4⌐ i≤ implemented¼ thσ curren⌠ value≤ specif∙ thσ targe⌠ ì
  655. erro≥ recover∙ criteria«  Iµ thi≤ pagσ i≤ no⌠ implemented¼ thσ erro≥ recover∙ ì
  656. i≤ vendo≥ specific.
  657.  
  658. .cp 7è.pm 3
  659. ááIε thσ casσ oµ aε unrecovereΣ reaΣ error¼ iµ thσ fixeΣ bi⌠ i≤ one¼ thσ valiΣ ì
  660. bi⌠ shal∞ bσ se⌠ t∩ onσ anΣ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ ì
  661. requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ reaΣ (no⌠ ì
  662. includinτ thσ unrecovereΣ block)«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ valiΣ bi⌠ ì
  663. shal∞ bσ se⌠ t∩ onσ anΣ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  664. transfe≥ length«  Upoε termination¼ thσ logica∞ positioε shal∞ bσ afte≥ thσ ì
  665. unrecovereΣ block.
  666.  
  667. .cp 6
  668. ááIε thσ casσ oµ aε unrecovereΣ writσ error¼ iµ unbuffereΣ modσ i≤ selecteΣ ì
  669. anΣ thσ fixeΣ bi⌠ i≤ se⌠ t∩ one¼ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ onσ anΣ thσ ì
  670. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  671. actua∞ numbe≥ oµ block≤ written«  Iµ unbuffereΣ modσ i≤ selecteΣ anΣ thσ fixeΣ ì
  672. bi⌠ i≤ se⌠ t∩ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  673. transfe≥ length.
  674.  
  675. .cp 10
  676. ááIε thσ casσ oµ aε unrecovereΣ writσ erro≥ o≥ ß deferreΣ writσ error¼ iµ ì
  677. buffereΣ modσ i≤ selecteΣ anΣ thσ fixeΣ bi⌠ i≤ one¼ thσ valiΣ bi⌠ shal∞ bσ se⌠ ì
  678. t∩ onσ anΣ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ numbe≥ oµ blocks¼ ì
  679. filemarks¼ anΣ setmark≤ no⌠ writteε (thσ numbe≥ oµ block≤ no⌠ transferreΣ froφ ì
  680. thσ initiato≥ plu≤ thσ numbe≥ oµ blocks¼ filemarks¼ anΣ setmark≤ remaininτ iε ì
  681. thσ target'≤ buffer)«  Iµ buffereΣ modσ i≤ selecteΣ anΣ thσ fixeΣ bi⌠ i≤ zero¼ ì
  682. thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ numbe≥ oµ bytes¼ filemarks¼ ì
  683. anΣ setmark≤ no⌠ writteε (thσ numbe≥ oµ byte≤ no⌠ transferreΣ froφ thσ ì
  684. initiato≥ plu≤ thσ numbe≥ oµ bytes¼ filemarks¼ anΣ setmark≤ remaininτ iε thσ ì
  685. target'≤ buffer)«  Iε botΦ cases¼ thσ valuσ iε thσ informatioε fielΣ ma∙ ì
  686. exceeΣ thσ transfe≥ length.
  687.  
  688. .cp 5
  689. ááIε thσ casσ oµ aε unrecovereΣ writσ erro≥ o≥ ß deferreΣ writσ error¼ iµ ì
  690. buffereΣ modσ 1Φ i≤ selected¼ thσ erro≥ shal∞ bσ reporteΣ t∩ thσ firs⌠ ì
  691. initiato≥ issuinτ ß commanΣ (othe≥ thaε INQUIR┘ o≥ REQUES╘ SENSE⌐ o≥ thσ firs⌠ ì
  692. initiato≥ respondinτ t∩ asynchronou≤ even⌠ notification«  Iµ buffereΣ modσ 2Φ ì
  693. i≤ selected¼ thσ erro≥ shal∞ bσ reporteΣ t∩ thσ initiato≥ witΦ unwritteε datß ì
  694. iε thσ buffer.
  695.  
  696.  
  697.  
  698. .cp 55è.aw off
  699. .pm 0
  700. 9.2. Command Descriptions for Sequential-Access Devices
  701. .aw on
  702. .pm 3
  703.  
  704. ááThσ command≤ fo≥ sequentia∞-acces≤ device≤ shal∞ bσ a≤ showε iε Tablσ ╣-1.
  705.  
  706. .aw off
  707. .pm 0
  708.               Table 9-1: Commands for Sequential-Access Devices
  709.  
  710. ==============================================================================
  711.                                Operation
  712. CommanΣ Namσ                     Codσ         Typσ    Section
  713. ------------------------------------------------------------------------------
  714.  CHANG┼ DEFINITION                40Φ          ╧       7.2.1
  715.  COMPAR┼                          39Φ          ╧       7.2.2
  716.  COP┘                             18Φ          ╧       7.2.3
  717.  COP┘ AN─ VERIF┘                  3AΦ          ╧       7.2.4
  718.  ERAS┼                            19Φ          ═       9.2.1
  719.  INQUIR┘                          12Φ          ═       7.2.5
  720.  LOA─ UNLOA─                      1BΦ          ╧       9.2.2
  721.  LOCAT┼                           2BΦ          ╧       9.2.3
  722.  LO╟ SELEC╘                       4CΦ          O       7.2.6
  723.  LO╟ SENS┼                        4DΦ          O       7.2.7
  724.  MOD┼ SELEC╘(6)                   15Φ          ═       7.2.8
  725.  MOD┼ SELEC╘(10)                  55Φ          O       7.2.9
  726.  MOD┼ SENS┼(6)                    1AΦ          ═       7.2.10
  727.  MOD┼ SENS┼(10)                   5AΦ          O       7.2.11
  728.  PREVEN╘ ALLO╫ MEDIU═ REMOVA╠     1Eh          ╧       8«2.4
  729.  REA─                             08Φ          ═       9.2.4
  730.  REA─ BLOCK LIMIT╙                05Φ          ═       9.2.5
  731.  REA─ BUFFE╥                      3CΦ          ╧       7.2.12
  732.  REA─ POSITIO╬                    34Φ          ╧       9.2.6
  733.  REA─ REVERS┼                     0FΦ          ╧       9«2.7
  734.  RECEIV┼ DIAGNOSTI├ RESULT╙       1CΦ          ╧       7.2.13
  735.  RECOVE╥ BUFFERE─ DAT┴            14Φ          ╧       9.2.8
  736.  RELEAS┼ UNI╘                     17Φ          ═       9.2.9
  737.  REQUES╘ SENS┼                    03Φ          ═       7.2.14
  738.  RESERV┼ UNI╘                     16Φ          ═       9.2.10
  739.  REWIN─                           01Φ          ═       9.2.11
  740.  SEN─ DIAGNOSTI├                  1DΦ          ═       7.2.15
  741.  SPAC┼                            11Φ          ═       9.2.12
  742.  TES╘ UNI╘ READ┘                  00Φ          ═       7.2.16
  743.  VERIF┘                           13Φ          ╧       9.2.13
  744.  WRIT┼                            0AΦ          ═       9.2.14
  745.  WRIT┼ BUFFE╥                     3BΦ          ╧       7.2.17
  746.  WRIT┼ FILEMARK╙                  10Φ          ═       9.2.15
  747. ==============================================================================
  748. .aw on
  749. .pm 3
  750.  
  751. ááKey║ ═  ╜  CommanΣ implementatioε i≤ mandatory.
  752. áá     ╧  ╜  CommanΣ implementatioε i≤ optional.
  753.  
  754. ááThσ followinτ commanΣ code≤ arσ vendo≥ specific║ 02h¼ 06h¼ 07h¼ 09h¼ 0Ch¼ ì
  755. 0Dh¼ 0Eh«  Al∞ othe≥ commanΣ code≤ fo≥ sequentia∞-acces≤ device≤ arσ reserveΣ ì
  756. fo≥ futurσ standardization.
  757.  
  758. .cp 25è.aw off
  759. .pm 0
  760. 9.2.1. ERASE Command
  761.  
  762.                           Table 9-2: ERASE Command
  763.  
  764. ==============================================================================
  765.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  766. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  767. ==============================================================================
  768.  0   |                           Operation Code (19h)                        |
  769. -----|-----------------------------------------------------------------------|
  770.  1   |   Logical Unit Number    |         ReserveΣ          | Immed |  Long  |
  771. -----|-----------------------------------------------------------------------|
  772.  2   |                           Reserved                                    |
  773. -----|-----------------------------------------------------------------------|
  774.  3   |                           Reserved                                    |
  775. -----|-----------------------------------------------------------------------|
  776.  4   |                           Reserved                                    |
  777. -----|-----------------------------------------------------------------------|
  778.  ╡   ⁿ                           Control                                     |
  779. ==============================================================================
  780. .aw on
  781. .pm 3
  782.  
  783.  
  784. .cp 4
  785. ááThσ ERAS┼ commanΣ (Tablσ ╣-2⌐ cause≤ par⌠ o≥ al∞ oµ thσ mediuφ t∩ bσ eraseΣ ì
  786. beginninτ a⌠ thσ curren⌠ positioε oε thσ logica∞ unit«  A≤ useΣ here¼ "erasedó ì
  787. mean≤ eithe≥ thσ mediuφ shal∞ bσ eraseΣ o≥ ß patterε shal∞ bσ writteε oε thσ ì
  788. mediuφ tha⌠ appear≤ a≤ ß ga≡ t∩ thσ target.
  789.  
  790. .cp 5
  791. ááAε immediatσ (Immed⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ returε ì
  792. statu≤ unti∞ thσ erasσ operatioε ha≤ completed«  Aε ImmeΣ bi⌠ oµ onσ indicate≤ ì
  793. tha⌠ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ thσ commanΣ ha≤ beeε validated« ì
  794. Iµ CHEC╦ CONDITIO╬ statu≤ i≤ returneΣ fo≥ aε ERAS┼ commanΣ witΦ aε ImmeΣ bi⌠ ì
  795. oµ one¼ thσ erasσ operatioε shal∞ no⌠ bσ performed« 
  796.  
  797. .cp 6
  798. áá┴ lonτ bi⌠ oµ onσ indicate≤ tha⌠ al∞ remaininτ mediuφ iε thσ curren⌠ ì
  799. partitioε shal∞ bσ eraseΣ beginninτ a⌠ thσ curren⌠ logica∞ position«  Iµ thσ ì
  800. ImmeΣ bi⌠ i≤ one¼ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ al∞ buffereΣ ì
  801. command≤ havσ completeΣ executioε anΣ thσ commanΣ descripto≥ blocδ oµ thσ ì
  802. ERAS┼ commanΣ ha≤ beeε validated«  Thσ logica∞ positioε followinτ aε ERAS┼ ì
  803. commanΣ witΦ ß lonτ bi⌠ oµ onσ i≤ no⌠ specifieΣ b∙ thi≤ standard.
  804.  
  805. .cp 2
  806. .lm3
  807. ááIMPLEMENTOR╙ NOTE║  Somσ target≤ ma∙ rejec⌠ aε ERAS┼ commanΣ witΦ thσ lonτ ì
  808. áábi⌠ se⌠ t∩ onσ iµ thσ logica∞ uni⌠ i≤ no⌠ a⌠ beginninτ-oµ-partition.
  809. .lm1
  810.  
  811. .cp 6
  812. áá┴ lonτ bi⌠ oµ zer∩ specifie≤ aε erasσ ga≡ defineΣ b∙ thσ ga≡ sizσ fielΣ iε ì
  813. thσ devicσ configuratioε pagσ (9.3.3.1)«  Iµ thσ ga≡ sizσ i≤ zer∩ o≥ thσ fielΣ ì
  814. i≤ no⌠ supported¼ ß devicσ defineΣ erasσ ga≡ operatioε shal∞ bσ performed«  Iµ ì
  815. thσ ImmeΣ bi⌠ i≤ one¼ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ thσ commanΣ ì
  816. descripto≥ blocδ ha≤ beeε validated«  Erasσ gap≤ ma∙ bσ useΣ iε hos⌠ ì
  817. controlleΣ erro≥ recover∙ o≥ "updatσ iε placeó applications« 
  818.  
  819. .cp 7èááIµ thσ logica∞ uni⌠ encounter≤ earl∙-warninτ durinτ aε ERAS┼ command¼ anΣ ì
  820. an∙ buffereΣ data¼ filemarks¼ o≥ setmark≤ remaiε t∩ bσ written¼ thσ targe⌠ ì
  821. actioε shal∞ bσ a≤ defineΣ fo≥ thσ earl∙-warninτ conditioε oµ thσ WRIT┼ ì
  822. commanΣ (9.2.14)«  Iµ thσ lonτ bi⌠ i≤ zero¼ thσ erasσ operatioε shal∞ ì
  823. terminatσ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ returε sensσ datß a≤ defineΣ fo≥ thσ ì
  824. WRIT┼ command«  An∙ buffereΣ erase≤ arσ no⌠ reporteΣ a≤ par⌠ oµ thσ ì
  825. informatioε field.
  826.  
  827. .cp 25
  828. .aw off
  829. .pm 0
  830. 9.2.2. LOA─ UNLOAD Command
  831.  
  832.                        Table 9-3: LOA─ UNLOAD Command
  833.  
  834. ==============================================================================
  835.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  836. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  837. ==============================================================================
  838.  0   |                           Operation Code (1Bh)                        |
  839. -----|-----------------------------------------------------------------------|
  840.  1   |   Logical Unit Number    |              ReserveΣ             | Immed  |
  841. -----|-----------------------------------------------------------------------|
  842.  2   |                           Reserved                                    |
  843. -----|-----------------------------------------------------------------------|
  844.  3   |                           Reserved                                    |
  845. -----|-----------------------------------------------------------------------|
  846.  4   |                           Reserved         |   EOT  | Re-Ten |  Load  |
  847. -----|-----------------------------------------------------------------------|
  848.  ╡   ⁿ                           Control                                     |
  849. ==============================================================================
  850. .aw on
  851. .pm 3
  852.  
  853.  
  854. .cp 5
  855. ááThσ LOA─ UNLOA─ commanΣ (Tablσ ╣-3⌐ request≤ tha⌠ thσ targe⌠ enablσ o≥ ì
  856. disablσ thσ logica∞ uni⌠ fo≥ furthe≥ operations«  Thi≤ commanΣ ma∙ als∩ bσ ì
  857. useΣ t∩ reques⌠ ß rσ-tensioε function«  Prio≥ t∩ performinτ thσ loaΣ o≥ unloaΣ ì
  858. operation¼ thσ targe⌠ shal∞ ensurσ tha⌠ al∞ buffereΣ data¼ filemarks¼ anΣ ì
  859. setmark≤ havσ beeε transferreΣ t∩ thσ medium.
  860.  
  861. .cp 7
  862. ááAε immediatσ (Immed⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ returε ì
  863. statu≤ unti∞ thσ loaΣ o≥ unloaΣ operatioε ha≤ completed«  Aε ImmeΣ bi⌠ oµ onσ ì
  864. indicate≤ tha⌠ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ al∞ buffereΣ command≤ ì
  865. havσ completeΣ executioε anΣ thσ commanΣ descripto≥ blocδ oµ thσ LOA─ UNLOA─ ì
  866. commanΣ ha≤ beeε validated«  Iµ CHEC╦ CONDITIO╬ statu≤ i≤ returneΣ fo≥ ß LOA─ ì
  867. UNLOA─ commanΣ witΦ aε ImmeΣ bi⌠ oµ one¼ thσ loaΣ o≥ unloaΣ operatioε shal∞ ì
  868. no⌠ bσ performed.
  869.  
  870. .cp 5
  871. .lm 3
  872. ááIMPLEMENTOR╙ NOTE║  Fo≥ compatibilit∙ witΦ device≤ implementeΣ prio≥ t∩ thi≤ ì
  873. ááversioε oµ thσ standard¼ ß WRIT┼ FILEMARK╙ commanΣ witΦ aε ImmeΣ bi⌠ oµ zer∩ ì
  874. ááshoulΣ bσ useΣ t∩ ensurσ tha⌠ al∞ buffereΣ data¼ filemarks¼ o≥ setmark≤ havσ ì
  875. áábeeε transferreΣ t∩ thσ mediuφ prio≥ t∩ issuinτ ß LOA─ UNLOA─ commanΣ witΦ ì
  876. ááaε ImmeΣ bi⌠ oµ one.
  877. .lm 1
  878.  
  879. .cp 4
  880. ááAε enΣ-oµ-tapσ (EOT⌐ bi⌠ oµ onσ indicate≤ tha⌠ aε unloaΣ operatioε (loaΣ bi⌠ ì
  881. se⌠ t∩ zero⌐ shal∞ positioε thσ mediuφ a⌠ enΣ-oµ-mediuφ fo≥ remova∞ froφ thσ ì
  882. device«  Aε EO╘ bi⌠ oµ zer∩ indicate≤ tha⌠ aε unloaΣ operatioε shal∞ positioε ì
  883. thσ mediuφ a⌠ beginninτ-oµ-mediuφ fo≥ remova∞ froφ thσ device.
  884. è.cp 3
  885. ááAε EO╘ bi⌠ oµ onσ anΣ ß loaΣ bi⌠ oµ onσ shal∞ causσ thσ targe⌠ t∩ returε ì
  886. CHEC╦ CONDITIO╬ statu≤ anΣ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ ILLEGA╠ REQUES╘ iε ì
  887. thσ sensσ data.
  888.  
  889. .cp 3
  890. áá┴ rσ-tensioε (Rσ-Ten⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ mediuφ oε thσ logica∞ ì
  891. uni⌠ shal∞ bσ correctl∙ tensioned«  Implementatioε oµ thσ rσ-tensioε functioε ì
  892. i≤ devicσ specific.
  893.  
  894. .cp 8
  895. ááIµ thσ loaΣ bi⌠ i≤ se⌠ t∩ one¼ thσ mediuφ iε thσ logica∞ uni⌠ shal∞ bσ ì
  896. loadeΣ anΣ positioneΣ t∩ thσ beginninτ-oµ-partitioε zero«  Iµ thσ loaΣ bi⌠ i≤ ì
  897. zero¼ thσ mediuφ iε thσ logica∞ uni⌠ shal∞ bσ positioneΣ fo≥ remova∞ a⌠ thσ ì
  898. extremσ positioε alonτ thσ mediuφ specifieΣ b∙ thσ EO╘ bit«  Followinτ ì
  899. successfu∞ completioε oµ aε unloaΣ operation¼ thσ targe⌠ shal∞ returε CHEC╦ ì
  900. CONDITIO╬ statu≤ witΦ thσ sensσ ke∙ se⌠ t∩ NO╘ READ┘ fo≥ al∞ subsequen⌠ ì
  901. mediuφ-acces≤ command≤ unti∞ ß ne≈ volumσ i≤ mounteΣ o≥ ß loaΣ operatioε i≤ ì
  902. successfull∙ completed.
  903.  
  904. .cp 4
  905. ááWheε operatinτ iε buffereΣ modσ 1Φ o≥ 2Φ (seσ 9.3.3)¼ thσ targe⌠ shal∞ ì
  906. discarΣ an∙ unwritteε buffereΣ datß afte≥ thσ LOA─ UNLOA─ commanΣ i≤ validateΣ ì
  907. iµ thσ previou≤ commanΣ wa≤ terminateΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ ì
  908. devicσ i≤ unablσ t∩ continuσ successfull∙ writing« 
  909.  
  910. .cp 35è.aw off
  911. .pm 0
  912. 9.2.3. LOCATE Command
  913.  
  914.                           Table 9-4: LOCATE Command
  915.  
  916. ==============================================================================
  917.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  918. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  919. ==============================================================================
  920.  0   |                           Operation Code (2Bh)                        |
  921. -----|-----------------------------------------------------------------------|
  922.  ▒   ⁿ    Logica∞ Uni⌠ Numbe≥   ⁿ      ReserveΣ   |   BT   |   CP   | Immed  |
  923. -----|-----------------------------------------------------------------------|
  924.  2   |                           Reserved                                    |
  925. -----|-----------------------------------------------------------------------|
  926.  3   | (MSB)                                                                 |
  927. -----|---                                                                 ---|
  928.  4   |                                                                       |
  929. -----|---                        Block Addres≤                            ---|
  930.  5   |                                                                       |
  931. -----|---                                                                 ---|
  932.  6   |                                                                 (LSB) |
  933. -----|-----------------------------------------------------------------------|
  934.  7   |                           Reserved                                    |
  935. -----|-----------------------------------------------------------------------|
  936.  8   |                           Partition                                   |
  937. -----|-----------------------------------------------------------------------|
  938.  ╣   ⁿ                           Control                                     |
  939. ==============================================================================
  940. .aw on
  941. .pm 3
  942.  
  943.  
  944. .cp 4
  945. ááLOCAT┼ commanΣ (Tablσ ╣-4⌐ cause≤ thσ targe⌠ t∩ positioε thσ logica∞ uni⌠ t∩ ì
  946. thσ specifieΣ blocδ addres≤ iε ß specifieΣ partition«  Upoε completion¼ thσ ì
  947. logica∞ positioε shal∞ bσ beforσ thσ specifieΣ location«  Prio≥ t∩ performinτ ì
  948. thσ locatσ operation¼ thσ targe⌠ shal∞ ensurσ tha⌠ al∞ buffereΣ data¼ ì
  949. filemarks¼ anΣ setmark≤ havσ beeε transferreΣ t∩ thσ medium.
  950.  
  951. áá┴ blocδ addres≤ typσ (BT⌐ bi⌠ oµ onσ indicate≤ thσ valuσ iε thσ blocδ ì
  952. addres≤ fielΣ shal∞ bσ interpreteΣ a≤ ß devicσ-specifiπ value«  ┴ B╘ bi⌠ oµ ì
  953. zer∩ indicate≤ thσ valuσ iε thσ blocδ addres≤ fielΣ shal∞ bσ interpreteΣ a≤ aε ì
  954. SCS╔ logica∞ blocδ address.
  955.  
  956. áá┴ changσ partitioε (CP⌐ bi⌠ oµ onσ indicate≤ tha⌠ ß changσ t∩ thσ partitioε ì
  957. specifieΣ iε thσ partitioε fielΣ i≤ t∩ occu≥ prio≥ t∩ positioninτ t∩ thσ blocδ ì
  958. specifieΣ iε thσ blocδ addres≤ field«  ┴ C╨ bi⌠ oµ zer∩ indicate≤ n∩ partitioε ì
  959. changσ i≤ t∩ bσ madσ anΣ thσ partitioε fielΣ i≤ t∩ bσ ignored.
  960.  
  961. .cp 7
  962. ááAε immediatσ (Immed⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ returε ì
  963. statu≤ unti∞ thσ locatσ operatioε ha≤ completed«  Aε ImmeΣ bi⌠ oµ onσ ì
  964. indicate≤ tha⌠ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ al∞ buffereΣ command≤ ì
  965. havσ completeΣ executioε anΣ thσ commanΣ descripto≥ blocδ oµ thσ LOCAT┼ ì
  966. commanΣ ha≤ beeε validated«  Iµ CHEC╦ CONDITIO╬ statu≤ i≤ returneΣ fo≥ ß ì
  967. LOCAT┼ commanΣ witΦ aε ImmeΣ bi⌠ oµ one¼ thσ locatσ operatioε shal∞ no⌠ bσ ì
  968. performed.
  969.  
  970. .cp 2èááThσ blocδ addres≤ fielΣ specifie≤ thσ blocδ addres≤ t∩ whicΦ thσ targe⌠ ì
  971. shal∞ positioε thσ mediuφ baseΣ oε thσ curren⌠ settinτ oµ thσ B╘ bit.
  972.  
  973. .cp 3
  974. ááThσ partitioε fielΣ specifie≤ whicΦ partitioε t∩ selec⌠ iµ thσ C╨ bi⌠ i≤ ì
  975. one«  Refe≥ t∩ thσ sequentia∞-acces≤ devicσ mode∞ (9.1.3⌐ anΣ thσ mediuφ ì
  976. partitioε page≤ (9.3.3.▓ anΣ 9.3.3.3⌐ fo≥ additiona∞ informatioε abou⌠ ì
  977. partitioning.
  978.  
  979. .cp 25
  980. .aw off
  981. .pm 0
  982. 9.2.4. READ Command
  983.  
  984.                            Table 9-5: READ Command
  985.  
  986. ==============================================================================
  987.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  988. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  989. ==============================================================================
  990.  0   |                           Operation Code (08h)                        |
  991. -----|-----------------------------------------------------------------------|
  992.  ▒   ⁿ   Logica∞ Uni⌠ Numbe≥     ⁿ        Reserved         ⁿ  SIL╔  ⁿ FixeΣ  |
  993. ¡¡¡¡-ⁿ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡-|
  994.  2   | (MSB)                                                                 |
  995. -----|---                                                                 ---|
  996.  3   |                           Transfer Length                             |
  997. -----|---                                                                 ---|
  998.  4   |                                                                 (LSB) |
  999. -----|-----------------------------------------------------------------------|
  1000.  ╡   ⁿ                           Control                                     |
  1001. ==============================================================================
  1002. .aw on
  1003. .pm 3
  1004.  
  1005.  
  1006. .c≡ 3
  1007. ááThσ REA─ commanΣ (Tablσ ╣-6⌐ request≤ tha⌠ thσ targe⌠ transfe≥ onσ o≥ morσ ì
  1008. block(s⌐ oµ datß t∩ thσ initiato≥ beginninτ witΦ thσ nex⌠ blocδ oε thσ logica∞ ì
  1009. unit.
  1010.  
  1011. .cp 3
  1012. ááThσ fixeΣ bi⌠ specifie≤ whethe≥ fixeΣ-lengtΦ o≥ variablσ-lengtΦ block≤ arσ ì
  1013. t∩ bσ transferred«  Refe≥ t∩ thσ REA─ BLOC╦ LIMIT╙ commanΣ (9.2.5⌐ fo≥ ì
  1014. additiona∞ informatioε abou⌠ fixeΣ anΣ variablσ blocδ mode.
  1015.  
  1016. .cp 5
  1017. ááIµ thσ fixeΣ bi⌠ i≤ one¼ thσ transfe≥ lengtΦ specifie≤ thσ numbe≥ oµ fixeΣ-ì
  1018. lengtΦ block≤ t∩ bσ transferred¼ usinτ thσ curren⌠ blocδ lengtΦ reporteΣ iε ì
  1019. thσ modσ parameter≤ blocδ descripto≥ (7.3.3)«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ ß ì
  1020. variablσ-lengtΦ blocδ i≤ requesteΣ witΦ thσ transfe≥ lengtΦ specifyinτ thσ ì
  1021. maximuφ numbe≥ oµ byte≤ allocateΣ fo≥ thσ returneΣ data.
  1022.  
  1023. .cp 6
  1024. áá┴ successfu∞ REA─ commanΣ witΦ ß fixeΣ bi⌠ oµ onσ shal∞ transfe≥ thσ ì
  1025. requesteΣ transfe≥ lengtΦ time≤ thσ curren⌠ blocδ lengtΦ iε byte≤ t∩ thσ ì
  1026. initiator«  ┴ successfu∞ REA─ commanΣ witΦ ß fixeΣ bi⌠ oµ zer∩ shal∞ transfe≥ ì
  1027. thσ requesteΣ transfe≥ lengtΦ iε byte≤ t∩ thσ initiator«  Upoε completion¼ thσ ì
  1028. logica∞ positioε shal∞ bσ afte≥ thσ las⌠ blocδ transferreΣ (enΣ-oµ-partitioε ì
  1029. side).
  1030.  
  1031. .cp 10èááIµ thσ suppres≤ incorrec⌠ lengtΦ indicato≥ (SILI⌐ bi⌠ i≤ onσ anΣ thσ fixeΣ ì
  1032. bi⌠ i≤ zero¼ thσ targe⌠ shall:
  1033. áá(1⌐ repor⌠ CHEC╦ CONDITIO╬ statu≤ fo≥ aε incorrec⌠ lengtΦ conditioε onl∙ iµ ì
  1034. thσ overlengtΦ conditioε exist≤ (seσ 9.4⌐ anΣ thσ blocδ lengtΦ fielΣ iε thσ ì
  1035. modσ paramete≥ blocδ descripto≥ i≤ nonzer∩ (seσ 7.3.3)
  1036. áá(2⌐ no⌠ repor⌠ CHEC╦ CONDITIO╬ statu≤ iµ thσ onl∙ erro≥ i≤ thσ underlengtΦ ì
  1037. conditioε (seσ 9.4)¼ o≥ iµ thσ onl∙ erro≥ i≤ thσ overlengtΦ conditioε anΣ thσ ì
  1038. blocδ lengtΦ fielΣ oµ thσ modσ parameter≤ blocδ descripto≥ i≤ zero.
  1039.  
  1040. .lm 3
  1041. .cp 5
  1042. ááIMPLEMENTOR╙ NOTE║  Sincσ thσ residuσ informatioε normall∙ provideΣ iε thσ ì
  1043. ááinformatioε fielΣ oµ thσ sensσ datß ma∙ no⌠ bσ availablσ wheε thσ SIL╔ bi⌠ ì
  1044. áái≤ set¼ othe≥ method≤ fo≥ determininτ thσ actua∞ blocδ lengtΦ shoulΣ bσ useΣ ì
  1045. áá(e.g.¼ includinτ lengtΦ informatioε iε thσ datß block).
  1046. .lm1
  1047.  
  1048. .cp 3
  1049. ááIµ thσ SIL╔ bi⌠ i≤ onσ anΣ thσ fixeΣ bi⌠ i≤ one¼ thσ targe⌠ shal∞ terminatσ ì
  1050. thσ commanΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ ì
  1051. ILLEGA╠ REQUES╘ witΦ aε additiona∞ sensσ codσ oµ INVALI─ FIEL─ I╬ CDB.
  1052.  
  1053. .cp 12
  1054. ááIµ thσ SIL╔ bi⌠ i≤ zer∩ anΣ aε incorrec⌠ lengtΦ blocδ i≤ read¼ CHEC╦ ì
  1055. CONDITIO╬ statu≤ shal∞ bσ returneΣ anΣ thσ IL╔ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ ì
  1056. onσ iε thσ sensσ data«  Upoε termination¼ thσ logica∞ positioε shal∞ bσ afte≥ ì
  1057. thσ incorrec⌠ lengtΦ blocδ (enΣ-oµ-partitioε side)«  Iµ thσ fixeΣ bi⌠ i≤ one¼ ì
  1058. thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  1059. actua∞ numbe≥ oµ block≤ reaΣ (no⌠ includinτ thσ incorrec⌠ lengtΦ block)«  Iµ ì
  1060. thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  1061. transfe≥ lengtΦ minu≤ thσ actua∞ blocδ length«  Target≤ tha⌠ d∩ no⌠ suppor⌠ ì
  1062. negativσ value≤ shal∞ se⌠ thσ informatioε fielΣ t∩ zer∩ iµ thσ overlengtΦ  ì
  1063. conditioε exist≤ (seσ 9.4).
  1064.  
  1065. .lm 3
  1066. ááIMPLEMENTOR╙ NOTE║  Iε thσ abovσ casσ witΦ thσ fixeΣ bi⌠ oµ one¼ onl∙ thσ ì
  1067. áápositioε oµ thσ incorrec⌠-lengtΦ logica∞ blocδ caε bσ determineΣ froφ thσ ì
  1068. áásensσ data«  Thσ actua∞ lengtΦ oµ thσ incorrec⌠ blocδ i≤ no⌠ reported«  ì
  1069. ááOthe≥ mean≤ ma∙ bσ useΣ t∩ determinσ it≤ actua∞ lengtΦ (e.g.¼ reaΣ i⌠ agaiε ì
  1070. ááwitΦ thσ fixeΣ bi⌠ se⌠ t∩ zero).
  1071. .lm 1
  1072.  
  1073. .cp 3
  1074. áá┴ transfe≥ lengtΦ oµ zer∩ indicate≤ tha⌠ n∩ datß shal∞ bσ transferred«  Thi≤ ì
  1075. conditioε shal∞ no⌠ bσ considereΣ aε erro≥ anΣ thσ logica∞ positioε shal∞ no⌠ ì
  1076. bσ changed.
  1077.  
  1078. .cp 9
  1079. ááIµ thσ logica∞ uni⌠ encounter≤ ß filemarδ durinτ ß REA─ command¼ CHEC╦ ì
  1080. CONDITIO╬ statu≤ shal∞ bσ returneΣ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ bσ ì
  1081. se⌠ t∩ onσ iε thσ sensσ data«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ o≥ ì
  1082. RECOVERE─ ERROR¼ a≤ appropriate«  Upoε termination¼ thσ logica∞ positioε shal∞ ì
  1083. bσ afte≥ thσ filemarδ (enΣ-oµ-partitioε side)«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ ì
  1084. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  1085. actua∞ numbe≥ oµ block≤ reaΣ (no⌠ includinτ thσ filemark)«  Iµ thσ fixeΣ bi⌠ ì
  1086. i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ length« 
  1087.  
  1088. .cp 13èááIµ thσ logica∞ uni⌠ encounter≤ ß setmarδ durinτ ß REA─ commanΣ anΣ thσ RSmδ ì
  1089. bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ (9.3.3.1)¼ CHEC╦ CONDITIO╬ ì
  1090. statu≤ shal∞ bσ returneΣ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ ì
  1091. iε thσ sensσ data«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ o≥ RECOVERE─ ERROR¼ ì
  1092. a≤ appropriate¼ anΣ thσ additiona∞ sensσ codσ shal∞ bσ se⌠ t∩ SETMAR╦ ì
  1093. DETECTED«  Upoε termination¼ thσ logica∞ positioε shal∞ bσ afte≥ thσ setmarδ ì
  1094. (enΣ-oµ-partitioε side)«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε fielΣ shal∞ ì
  1095. bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ reaΣ ì
  1096. (no⌠ includinτ thσ setmark)«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ ì
  1097. shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ length«  Thσ targe⌠ shal∞ no⌠ returε ì
  1098. CHEC╦ CONDITIO╬ wheε ß setmarδ i≤ encountereΣ iµ thσ RSmδ bi⌠ i≤ se⌠ t∩ zer∩ ì
  1099. o≥ iµ thi≤ optioε i≤ no⌠ supported.
  1100.  
  1101. .cp 13
  1102. ááIµ thσ logica∞ uni⌠ encounter≤ earl∙-warninτ durinτ ß REA─ commanΣ anΣ thσ ì
  1103. RE╫ bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ (seσ 9.3.3.1)¼ CHEC╦ ì
  1104. CONDITIO╬ statu≤ shal∞ bσ returneΣ upoε completioε oµ thσ curren⌠ block«  Thσ ì
  1105. sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ o≥ RECOVERE─ ERROR¼ a≤ appropriate«  Thσ ì
  1106. EO═ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  Upoε termination¼ ì
  1107. thσ logica∞ positioε shal∞ bσ afte≥ thσ las⌠ blocδ transferreΣ (enΣ-oµ-ì
  1108. partitioε side)«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε fielΣ shal∞ bσ se⌠ ì
  1109. t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ read«  Iµ ì
  1110. thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  1111. transfe≥ lengtΦ minu≤ thσ actua∞ blocδ length«  Thσ targe⌠ shal∞ no⌠ returε ì
  1112. CHEC╦ CONDITIO╬ statu≤ wheε earl∙-warninτ i≤ encountereΣ iµ thσ RE╫ bi⌠ i≤ ì
  1113. zer∩ o≥ iµ thσ RE╫ optioε i≤ no⌠ supported.
  1114.  
  1115. .lm 3
  1116. .cp2
  1117. ááIMPLEMENTOR╙ NOTE║  ┴ RE╫ bi⌠ oµ onσ i≤ no⌠ recommendeΣ fo≥ mos⌠ systeφ ì
  1118. ááapplication≤ sincσ reaΣ datß ma∙ bσ presen⌠ afte≥ earl∙-warning« 
  1119.  
  1120. .lm 1
  1121. .cp 9
  1122. ááIµ thσ logica∞ uni⌠ encounter≤ enΣ-oµ-datß durinτ ß REA─ command¼ CHEC╦ ì
  1123. CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ BLAN╦ CHECK¼ ì
  1124. anΣ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  Iµ enΣ-oµ-datß i≤ ì
  1125. encountereΣ a⌠ o≥ afte≥ earl∙-warning¼ thσ EO═ bi⌠ shal∞ als∩ bσ se⌠ t∩ one« ì
  1126. Upoε termination¼ thσ logica∞ positioε shal∞ bσ afte≥ thσ las⌠ recordeΣ ì
  1127. logica∞ blocδ (enΣ-oµ-partitioε side)«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ ì
  1128. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  1129. actua∞ numbe≥ oµ block≤ read«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ ì
  1130. shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ length.
  1131.  
  1132. .cp 8
  1133. ááIµ thσ logica∞ uni⌠ encounter≤ enΣ-oµ-partitioε durinτ ß REA─ command¼ CHEC╦ ì
  1134. CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ MEDIU═ ì
  1135. ERROR¼ anΣ thσ EO═ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data« Thσ ì
  1136. mediuφ positioε followinτ thi≤ conditioε i≤ no⌠ defined«  Iµ thσ fixeΣ bi⌠ i≤ ì
  1137. one¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ ì
  1138. thσ actua∞ numbe≥ oµ block≤ read« Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε ì
  1139. fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ length.
  1140.  
  1141.  
  1142. .cp 25è.aw off
  1143. .pm 0
  1144. 9.2.5. READ BLOCK LIMITS Command
  1145.  
  1146.                     Table 9-6: READ BLOCK LIMITS Command
  1147.  
  1148. ==============================================================================
  1149.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1150. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1151. ==============================================================================
  1152.  0   |                           Operation Code (05h)                        |
  1153. -----|-----------------------------------------------------------------------|
  1154.  1   |   Logical Unit Number    |                  Reserved                  |
  1155. -----|-----------------------------------------------------------------------|
  1156.  2   |                           Reserved                                    |
  1157. -----|-----------------------------------------------------------------------|
  1158.  3   |                           Reserved                                    |
  1159. -----|-----------------------------------------------------------------------|
  1160.  4   |                           Reserved                                    |
  1161. -----|-----------------------------------------------------------------------|
  1162.  ╡   ⁿ                           Control                                     |
  1163. ==============================================================================
  1164. .aw on
  1165. .pm 3
  1166.  
  1167.  
  1168. .cp 4
  1169. ááThσ REA─ BLOC╦ LIMIT╙ commanΣ (Tablσ ╣-6⌐ request≤ tha⌠ thσ logica∞ unit'≤ ì
  1170. blocδ lengtΦ limit≤ capabilit∙ bσ returned«  Thσ REA─ BLOC╦ LIMIT╙ datß showε ì
  1171. iε Tablσ ╣-╖ shal∞ bσ returneΣ durinτ thσ DAT┴ I╬ phasσ oµ thσ command.
  1172.  
  1173. .aw off
  1174. .pm 0
  1175. .cp 20
  1176.                       Table 9-7: REA─ BLOC╦ LIMIT╙ Data
  1177.  
  1178. ==============================================================================
  1179.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1180. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1181. ==============================================================================
  1182.  0   |                           Reserved                                    |
  1183. -----|-----------------------------------------------------------------------|
  1184.  1   | (MSB)                                                                 |
  1185. -----|---                                                                 ---|
  1186.  2   |                           Maximum Block Length Limi⌠                  |
  1187. -----|---                                                                 ---|
  1188.  3   |                                                                 (LSB) |
  1189. -----|-----------------------------------------------------------------------|
  1190.  4   | (MSB)                                                                 |
  1191. -----|---                        Minimuφ Blocδ LengtΦ Limit               ---|
  1192.  ╡   ⁿ                                                                 (LSB⌐ |
  1193. ==============================================================================
  1194. .aw on
  1195. .pm 3
  1196.  
  1197.  
  1198. .cp 7
  1199. ááIµ thσ maximuφ blocδ lengtΦ limi⌠ equal≤ thσ minimuφ blocδ lengtΦ limit¼ thσ ì
  1200. logica∞ uni⌠ support≤ thσ transfe≥ oµ datß iε thσ fixeΣ-blocδ modσ only¼ witΦ ì
  1201. thσ blocδ lengtΦ equa∞ t∩ thσ giveε limit«  Iε thi≤ casσ thσ fixeΣ bi⌠ shal∞ ì
  1202. bσ se⌠ t∩ onσ iε thσ WRIT┼ anΣ REA─ commands
  1203.  
  1204. .cp 7èááIµ thσ maximuφ blocδ lengtΦ limi⌠ i≤ no⌠ equa∞ t∩ thσ minimuφ blocδ lengtΦ ì
  1205. limit¼ thσ logica∞ uni⌠ support≤ thσ transfe≥ oµ datß iε eithe≥ fixeΣ-blocδ o≥ ì
  1206. variablσ-blocδ modes¼ witΦ thσ blocδ lengtΦ constraineΣ betweeε thσ giveε ì
  1207. limit≤ iε eithe≥ mode«  Thσ transfe≥ modσ i≤ controlleΣ b∙ thσ fixeΣ bi⌠ iε ì
  1208. thσ WRIT┼ o≥ REA─ commands« Iµ thσ maximuφ blocδ limi⌠ i≤ zer∩ ß maximuφ blocδ ì
  1209. lengtΦ i≤ no⌠ specified.
  1210.  
  1211. .cp 35
  1212. .aw off
  1213. .pm 0
  1214. 9.2.6. READ POSITION Command
  1215.  
  1216.                       Table 9-8: REA─ POSITIO╬ Command
  1217.  
  1218. ==============================================================================
  1219.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1220. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1221. ==============================================================================
  1222.  0   |                           Operation Code (34h)                        |
  1223. -----|-----------------------------------------------------------------------|
  1224.  ▒   ⁿ   Logica∞ Uni⌠ Numbe≥    ⁿ             ReserveΣ              ⁿ   BT   |
  1225. -----|-----------------------------------------------------------------------|
  1226.  2   |                           Reserved                                    |
  1227. -----|-----------------------------------------------------------------------|
  1228.  3   |                           Reserved                                    |
  1229. -----|-----------------------------------------------------------------------|
  1230.  4   |                           Reserved                                    |
  1231. -----|-----------------------------------------------------------------------|
  1232.  5   |                           Reserved                                    |
  1233. -----|-----------------------------------------------------------------------|
  1234.  6   |                           Reserved                                    |
  1235. -----|-----------------------------------------------------------------------|
  1236.  7   |                           Reserved                                    |
  1237. -----|-----------------------------------------------------------------------|
  1238.  8   |                           Reserved                                    |
  1239. -----|-----------------------------------------------------------------------|
  1240.  ╣   ⁿ                           Control                                     |
  1241. ==============================================================================
  1242. .aw on
  1243. .pm 3
  1244.  
  1245.  
  1246. .cp 5
  1247. ááThσ REA─ POSITIO╬ commanΣ (Tablσ ╣-8⌐ report≤ thσ curren⌠ positioε oµ thσ ì
  1248. logica∞ uni⌠ anΣ an∙ datß block≤ iε thσ buffer«  N∩ mediuφ movemen⌠ shal∞ ì
  1249. occu≥ a≤ ß resul⌠ oµ thσ command«  
  1250.  
  1251. .cp 5
  1252. áá┴ blocδ addres≤ typσ (BT⌐ bi⌠ oµ onσ request≤ thσ targe⌠ t∩ returε it≤ ì
  1253. curren⌠ firs⌠ blocδ locatioε anΣ las⌠ blocδ locatioε a≤ ß devicσ-specifiπ ì
  1254. value«  ┴ B╘ bi⌠ oµ zer∩ request≤ thσ targe⌠ t∩ returε thσ firs⌠ blocδ ì
  1255. locatioε anΣ thσ las⌠ blocδ locatioε a≤ aε SCS╔ logica∞ blocδ addres≤ ì
  1256. (relativσ t∩ ß partition)«  
  1257.  
  1258. .cp 4
  1259. áá Iµ thσ logica∞ uni⌠ i≤ no⌠ capablσ oµ reportinτ blocδ locations¼ thσ BP╒ ì
  1260. bi⌠ shal∞ bσ se⌠ t∩ onσ iε thσ returneΣ data«  Suppor⌠ fo≥ thi≤ optioε oµ thσ ì
  1261. REA─ POSITIO╬ commanΣ i≤ indicateΣ b∙ ß BI╙ bi⌠ se⌠ t∩ onσ iε thσ devicσ ì
  1262. configuratioε pagσ (9.3.3.1).
  1263.  
  1264. .cp 2
  1265. ááThσ REA─ POSITIO╬ datß showε iε Tablσ ╣-╣ shal∞ bσ returneΣ durinτ thσ DAT┴ ì
  1266. I╬ phasσ oµ thσ command.
  1267. è.aw off
  1268. .pm 0
  1269. .cp 47
  1270.                     Table 9-9: READ POSITION Data Format
  1271.  
  1272. ==============================================================================
  1273.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1274. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1275. ==============================================================================
  1276.  0   |  BOP   |   ┼OP  |        Reserved          |  BPU   |     Reserved    |
  1277. -----|-----------------------------------------------------------------------|
  1278.  ▒   ⁿ                          Partition Number                             |
  1279. -----|-----------------------------------------------------------------------|
  1280.  2   |                          Reserved                                     |
  1281. -----|-----------------------------------------------------------------------|
  1282.  3   |                          Reserved                                     |
  1283. -----|-----------------------------------------------------------------------|
  1284.  4   | (MSB)                                                                 |
  1285. ¡ ¡ -|¡ ¡                       Firs⌠ Blocδ Location                      ¡ -|
  1286.  7   |                                                                 (LSB) |
  1287. -----|-----------------------------------------------------------------------|
  1288.  8   | (MSB)                                                                 |
  1289. ¡ ¡ -|¡ ¡                       Las⌠ Blocδ Location                       ¡ -|
  1290.  11  |                                                                 (LSB) |
  1291. -----|-----------------------------------------------------------------------|
  1292.  12  |                          Reserved                                     |
  1293. -----|-----------------------------------------------------------------------|
  1294.  13  | (MSB)                                                                 |
  1295. ¡ ¡ -|¡ -                       Number of Blocks in Buffer                ¡ -|
  1296.  15  |                                                                 (LSB) |
  1297. -----|-----------------------------------------------------------------------|
  1298.  16  | (MSB)                                                                 |
  1299. ¡ ¡ -|¡ -                       Numbe≥ oµ Byte≤ iε Buffe≥                 ¡ -|
  1300.  19  |                                                                 (LSB) |
  1301. ==============================================================================
  1302. .aw on
  1303. .pm 3
  1304.  
  1305.  
  1306. .cp4
  1307. áá┴ beginninτ oµ partitioε (BOP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ logica∞ uni⌠ i≤ ì
  1308. a⌠ thσ beginninτ-oµ-partitioε iε thσ curren⌠ partition«  ┴ BO╨ bi⌠ oµ zer∩ ì
  1309. indicate≤ tha⌠ thσ curren⌠ logica∞ positioε i≤ no⌠ a⌠ thσ beginninτ-oµ-ì
  1310. partition«  
  1311.  
  1312. .cp 4
  1313. ááAε enΣ oµ partitioε (EOP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ logica∞ uni⌠ i≤ ì
  1314. positioneΣ betweeε earl∙-warninτ anΣ enΣ-oµ-partitioε iε thσ curren⌠ ì
  1315. partition«  Aε EO╨ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ curren⌠ logica∞ positioε i≤ ì
  1316. no⌠ betweeε earl∙-warninτ anΣ enΣ-oµ-partition.
  1317.  
  1318. .cp 2
  1319. .lm3
  1320. ááIMPLEMENTOR╙ NOTE║  Thσ BO╨ anΣ EO╨ indication≤ arσ no⌠ necessaril∙ ß resul⌠ ì
  1321. ááoµ ß physica∞ tapσ marke≥ (e.g.¼ reflectivσ marker)« 
  1322. .lm1
  1323.  
  1324. .cp 4
  1325. áá┴ blocδ positioε unknowε (BPU⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ firs⌠ anΣ las⌠ ì
  1326. blocδ location≤ arσ no⌠ knowε o≥ canno⌠ bσ obtained«  ┴ BP╒ bi⌠ oµ zer∩ ì
  1327. indicate≤ tha⌠ thσ firs⌠ anΣ las⌠ blocδ locatioε field≤ contaiε valiΣ positioε ì
  1328. information.
  1329.  
  1330. .cp 3
  1331. ááThσ partitioε numbe≥ fielΣ report≤ thσ partitioε numbe≥ fo≥ thσ curren⌠ ì
  1332. logica∞ position«  Iµ thσ logica∞ uni⌠ onl∙ support≤ onσ partitioε fo≥ thσ ì
  1333. medium¼ thi≤ fielΣ shal∞ bσ se⌠ t∩ zero.è
  1334. .cp 4
  1335. ááThσ firs⌠ blocδ locatioε fielΣ indicate≤ thσ blocδ addres≤ associateΣ witΦ ì
  1336. thσ curren⌠ logica∞ position«  Thσ valuσ shal∞ indicatσ thσ blocδ addres≤ oµ ì
  1337. thσ nex⌠ datß blocδ t∩ bσ transferreΣ betweeε thσ initiato≥ anΣ thσ targe⌠ iµ ì
  1338. ß REA─ o≥ WRIT┼ commanΣ i≤ issued.
  1339.  
  1340. .cp 6
  1341. ááThσ las⌠ blocδ locatioε fielΣ indicate≤ thσ blocδ addres≤ associateΣ witΦ ì
  1342. thσ nex⌠ blocδ t∩ bσ transferreΣ froφ thσ buffe≥ t∩ thσ medium«  Thσ valuσ ì
  1343. shal∞ indicatσ thσ blocδ addres≤ oµ thσ nex⌠ datß blocδ t∩ bσ transferreΣ ì
  1344. betweeε thσ buffe≥ anΣ thσ medium«  Iµ thσ buffe≥ doe≤ no⌠ contaiε ß wholσ ì
  1345. blocδ oµ datß o≥ i≤ empty¼ thσ valuσ reporteΣ fo≥ thσ las⌠ blocδ locatioε ì
  1346. shal∞ bσ equa∞ t∩ thσ valuσ reporteΣ fo≥ thσ firs⌠ blocδ location.
  1347.  
  1348. .cp 4
  1349. .lm3
  1350. ááIMPLEMENTOR╙ NOTE║  Thσ informatioε provideΣ b∙ thσ firs⌠ anΣ las⌠ blocδ ì
  1351. áálocatioε field≤ caε bσ useΣ iε conjunctioε witΦ thσ LOCAT┼ commanΣ t∩ ì
  1352. áápositioε thσ mediuφ a⌠ thσ appropriatσ logica∞ blocδ oε anothe≥ devicσ iε ì
  1353. ááthσ casσ oµ unrecoverablσ error≤ oε thσ firs⌠ device.
  1354. .lm1
  1355.  
  1356. .cp 2
  1357. ááThσ numbe≥ oµ block≤ iε buffe≥ fielΣ indicate≤ thσ numbe≥ oµ datß block≤ iε ì
  1358. thσ target'≤ buffe≥ tha⌠ havσ no⌠ beeε writteε t∩ thσ medium.
  1359.  
  1360. .cp 2
  1361. ááThσ numbe≥ oµ byte≤ iε buffe≥ fielΣ indicate≤ thσ tota∞ numbe≥ oµ datß byte≤ ì
  1362. iε thσ target'≤ buffe≥ tha⌠ havσ no⌠ beeε writteε t∩ thσ medium.
  1363.  
  1364. .cp 25
  1365. .aw off
  1366. .pm 0
  1367. 9.2.7. READ REVERSE Command
  1368.  
  1369.                        Table 9-10: READ REVERSE Command
  1370.  
  1371. ==============================================================================
  1372.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1373. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1374. ==============================================================================
  1375.  0   |                           Operation Code (0Fh)                        |
  1376. -----|-----------------------------------------------------------------------|
  1377.  ▒   ⁿ   Logica∞ Uni⌠ Numbe≥    ⁿ         ReserveΣ         ⁿ  SIL╔  ⁿ FixeΣ  |
  1378. -----|-----------------------------------------------------------------------|
  1379.  2   | (MSB)                                                                 |
  1380. -----|---                                                                 ---|
  1381.  3   |                           Transfer Length                             |
  1382. -----|---                                                                 ---|
  1383.  4   |                                                                 (LSB) |
  1384. -----|-----------------------------------------------------------------------|
  1385.  ╡   ⁿ                           Control                                     |
  1386. ==============================================================================
  1387. .aw on
  1388. .pm 3
  1389.  
  1390.  
  1391. .cp 3
  1392. ááThσ REA─ REVERS┼ commanΣ (Tablσ ╣-10⌐ request≤ tha⌠ thσ targe⌠ transfe≥ onσ ì
  1393. o≥ morσ block(s⌐ oµ datß t∩ thσ initiato≥ beginninτ a⌠ thσ curren⌠ positioε oε ì
  1394. thσ logica∞ unit.
  1395.  
  1396. .cp 6èááThσ executioε oµ thi≤ commanΣ i≤ simila≥ t∩ thσ REA─ commanΣ excep⌠ tha⌠ ì
  1397. mediuφ motioε i≤ iε thσ reversσ direction«  Al∞ block(s)¼ anΣ thσ byte(s⌐ ì
  1398. withiε thσ block(s)¼ arσ transferreΣ iε thσ reversσ order«  Thσ orde≥ oµ bit≤ ì
  1399. withiε eacΦ bytσ shal∞ no⌠ bσ changed«  Upoε completioε oµ ß REA─ REVERS┼ ì
  1400. command¼ thσ logica∞ positioε shal∞ bσ beforσ thσ las⌠ blocδ transferreΣ ì
  1401. (beginninτ-oµ-partitioε side).
  1402.  
  1403. .cp 2
  1404. ááRefe≥ t∩ thσ REA─ commanΣ (9.2.4⌐ fo≥ ß descriptioε oµ thσ fixeΣ bit¼ thσ ì
  1405. SIL╔ bit¼ thσ transfe≥ lengtΦ field¼ anΣ an∙ associateΣ erro≥ conditions.
  1406.  
  1407. .cp 4
  1408. ááFilemarks¼ setmarks¼ incorrec⌠ lengtΦ blocks¼ anΣ unrecovereΣ reaΣ error≤ ì
  1409. arσ handleΣ thσ samσ a≤ iε thσ REA─ command¼ excep⌠ tha⌠ upoε terminatioε thσ ì
  1410. logica∞ positioε shal∞ bσ beforσ thσ filemark¼ setmark¼ incorrec⌠ lengtΦ ì
  1411. block¼ o≥ unrecovereΣ blocδ (beginninτ-oµ-partitioε side).
  1412.  
  1413. .cp 7
  1414. ááIµ thσ logica∞ uni⌠ encounter≤ beginninτ-oµ-partitioε durinτ ß REA─ REVERS┼ ì
  1415. command¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returneΣ anΣ thσ EO═ anΣ valiΣ bit≤ ì
  1416. shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ ì
  1417. o≥ RECOVERE─ ERROR¼ a≤ appropriate«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε ì
  1418. fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ ì
  1419. block≤ transferred«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ ì
  1420. se⌠ t∩ thσ requesteΣ transfe≥ length.
  1421.  
  1422.  
  1423. .cp 25
  1424. .aw off
  1425. .pm 0
  1426. 9.2.8. RECOVER BUFFERED DATA Command
  1427.  
  1428.                   Table 9-11: RECOVER BUFFERED DATA Command
  1429.  
  1430. ==============================================================================
  1431.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1432. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1433. ==============================================================================
  1434.  0   |                           Operation Code (14h)                        |
  1435. -----|-----------------------------------------------------------------------|
  1436.  1   ⁿ   Logical Unit Number    |         Reserved         ⁿ  SIL╔  | Fixed  |
  1437. -----|-----------------------------------------------------------------------|
  1438.  2   | (MSB)                                                                 |
  1439. -----|---                                                                 ---|
  1440.  3   |                           Transfer Length                             |
  1441. -----|---                                                                 ---|
  1442.  4   |                                                                 (LSB) |
  1443. -----|-----------------------------------------------------------------------|
  1444.  ╡   ⁿ                           Control                                     |
  1445. ==============================================================================
  1446. .aw on
  1447. .pm 3
  1448.  
  1449.  
  1450. .cp 6
  1451. ááThσ RECOVE╥ BUFFERE─ DAT┴ commanΣ (Tablσ ╣-11⌐ i≤ useΣ t∩ recove≥ datß tha⌠ ì
  1452. ha≤ beeε transferreΣ t∩ thσ target'≤ buffe≥ bu⌠ ha≤ no⌠ beeε successfull∙ ì
  1453. writteε t∩ thσ medium«  I⌠ i≤ normall∙ useΣ t∩ recove≥ froφ erro≥ o≥ exceptioε ì
  1454. condition≤ tha⌠ makσ i⌠ impossiblσ t∩ writσ thσ buffereΣ datß t∩ thσ medium« ì
  1455. Onσ o≥ morσ RECOVE╥ BUFFERE─ DAT┴ command≤ ma∙ bσ requireΣ t∩ recove≥ al∞ ì
  1456. unwritteε buffereΣ data.
  1457.  
  1458. .cp 6èááThσ executioε oµ thi≤ commanΣ i≤ simila≥ t∩ thσ REA─ commanΣ excep⌠ tha⌠ thσ ì
  1459. datß i≤ transferreΣ froφ thσ target'≤ buffe≥ insteaΣ oµ thσ medium«  Thσ orde≥ ì
  1460. iε whicΦ block(s⌐ arσ transferreΣ i≤ defineΣ b∙ thσ RB╧ bi⌠ iε thσ devicσ ì
  1461. configuratioε pagσ (9.3.3.1)«  Iµ thσ RB╧ bi⌠ i≤ no⌠ implemented¼ block(s⌐ arσ ì
  1462. transferreΣ iε thσ samσ orde≥ the∙ woulΣ havσ beeε transferreΣ t∩ thσ medium.
  1463.  
  1464. .cp 2
  1465. ááRefe≥ t∩ thσ REA─ commanΣ (9.2.4⌐ fo≥ ß descriptioε oµ thσ fixeΣ bit¼ thσ ì
  1466. SIL╔ bit¼ thσ transfe≥ lengtΦ field¼ anΣ an∙ associateΣ erro≥ conditions.
  1467.  
  1468. .cp 5
  1469. ááIµ thσ fixeΣ bi⌠ i≤ zero¼ n∩ morσ thaε thσ requesteΣ transfe≥ lengtΦ shal∞ ì
  1470. bσ transferreΣ t∩ thσ initiator«  Iµ thσ requesteΣ transfe≥ lengtΦ i≤ smalle≥ ì
  1471. thaε thσ actua∞ lengtΦ oµ thσ logica∞ blocδ t∩ bσ recovered¼ onl∙ thσ ì
  1472. requesteΣ transfe≥ lengtΦ shal∞ bσ transferreΣ t∩ thσ initiato≥ anΣ thσ ì
  1473. remaininτ datß fo≥ thσ curren⌠ logica∞ blocδ shal∞ bσ discarded.
  1474.  
  1475. .cp 3
  1476. .lm3
  1477. ááIMPLEMENTOR╙ NOTE║  Durinτ recover∙ operation≤ involvinτ unknowε blocδ ì
  1478. áásizes¼ thσ initiato≥ shoulΣ selec⌠ thσ maximuφ blocδ lengtΦ supporteΣ b∙ thσ ì
  1479. áátarge⌠ t∩ ensurσ tha⌠ al∞ buffereΣ datß wil∞ bσ transferred.
  1480. .lm1
  1481.  
  1482. .cp 8
  1483. ááIµ ß buffereΣ filemarδ i≤ encountereΣ durinτ ß RECOVE╥ BUFFERE─ DAT┴ ì
  1484. command¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ ì
  1485. t∩ N╧ SENSE¼ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ ì
  1486. data«  Upoε termination¼ thσ logica∞ positioε shal∞ bσ afte≥ thσ filemark«  Iµ ì
  1487. thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  1488. transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ transferreΣ (no⌠ includinτ ì
  1489. thσ filemark)«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ ì
  1490. t∩ thσ requesteΣ transfe≥ length«  
  1491.  
  1492. .cp 12
  1493. ááIµ ß buffereΣ setmarδ i≤ encountereΣ durinτ ß RECOVE╥ BUFFERE─ DAT┴ commanΣ ì
  1494. anΣ thσ RSmδ bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ (9.3.3.1)¼ ì
  1495. CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returneΣ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ ì
  1496. bσ se⌠ t∩ onσ iε thσ sensσ data«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ anΣ ì
  1497. thσ additiona∞ sensσ codσ shal∞ bσ se⌠ t∩ SETMAR╦ DETECTED«  Upoε termination¼ ì
  1498. thσ logica∞ positioε shal∞ bσ afte≥ thσ setmark«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ ì
  1499. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  1500. actua∞ numbe≥ oµ block≤ transferreΣ (no⌠ includinτ thσ setmark)«  Iµ thσ fixeΣ ì
  1501. bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ ì
  1502. length« Thσ targe⌠ shal∞ no⌠ returε CHEC╦ CONDITIO╬ wheε ß setmarδ i≤ ì
  1503. encountereΣ iµ thσ RSmδ bi⌠ i≤ zer∩ o≥ iµ thi≤ optioε i≤ no⌠ supported.
  1504.  
  1505. .cp 7
  1506. ááIµ aε attemp⌠ i≤ madσ t∩ recove≥ morσ logica∞ block≤ oµ datß thaε arσ ì
  1507. containeΣ iε thσ target'≤ buffer¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ ì
  1508. thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENSE¼ anΣ thσ EO═ anΣ valiΣ bit≤ shal∞ bσ ì
  1509. se⌠ t∩ onσ iε thσ sensσ data«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε fielΣ ì
  1510. shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ ì
  1511. block≤ transferred«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ ì
  1512. se⌠ t∩ thσ requesteΣ transfe≥ length.
  1513.  
  1514. .cp 30è.aw off
  1515. .pm 0
  1516. 9.2.9. RELEASE UNI╘ Command
  1517.  
  1518.                        Table 9-12: RELEASE UNI╘ Command
  1519.  
  1520. ==============================================================================
  1521.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1522. Byte |        |        |        |        |        |        |        |        |
  1523. ==============================================================================
  1524.  0   |                           Operation Code (17h)                        |
  1525. -----|-----------------------------------------------------------------------|
  1526.  1   | Logical Unit Number      | 3rdPty | Third Party Device ID    |Reserved|
  1527. -----|-----------------------------------------------------------------------|
  1528.  2   |                           ReserveΣ                                    |
  1529. -----|-----------------------------------------------------------------------|
  1530.  3   |                           Reserved                                    |
  1531. -----|-----------------------------------------------------------------------|
  1532.  4   |                           Reserved                                    |
  1533. -----|-----------------------------------------------------------------------|
  1534.  5   |                           Control                                     |
  1535. ==============================================================================
  1536. .aw on
  1537. .pm 3
  1538.  
  1539.  
  1540. ááThσ RESERV┼ UNI╘ anΣ RELEAS┼ UNI╘ command≤ providσ thσ basiπ mechanisφ fo≥ ì
  1541. contentioε resolutioε iε multiplσ-initiato≥ systems«  Thσ RELEAS┼ UNI╘ commanΣ ì
  1542. (Tablσ ╣-12⌐ i≤ useΣ t∩ releasσ previousl∙ reserveΣ logica∞ unit≤ fo≥ thσ ì
  1543. requestinτ initiator¼ o≥ iµ i⌠ i≤ ß thirΣ-part∙ release¼ t∩ anothe≥ specifieΣ ì
  1544. SCS╔ device«  
  1545.  
  1546. ááIµ ß valiΣ reservatioε exist≤ fo≥ thσ I_T_╠ nexus¼ thσ targe⌠ shal∞ releasσ ì
  1547. thσ reservatioε anΣ returε GOO─ status.
  1548.  
  1549. ááI⌠ i≤ no⌠ aε erro≥ t∩ attemp⌠ t∩ releasσ ß reservatioε tha⌠ i≤ no⌠ currentl∙ ì
  1550. valid«  Iε thi≤ case¼ thσ targe⌠ shal∞ returε GOO─ statu≤ withou⌠ alterinτ an∙ ì
  1551. othe≥ reservation.
  1552.  
  1553. .cp 5
  1554. .aw off
  1555. .pm 0
  1556. 9.2.9.1. ThirΣ-Part∙ Releasσ 
  1557. .aw on
  1558. .pm 3
  1559. ááThirΣ-part∙ releasσ allow≤ aε initiato≥ t∩ releasσ ß logica∞ uni⌠ tha⌠ wa≤ ì
  1560. previousl∙ reserveΣ usinτ ß thirΣ-part∙ reservatioε (seσ 9.2.10.1)«  
  1561.  
  1562. ááIµ thσ thirΣ part∙ (3rdPty⌐ bi⌠ i≤ zero¼ theε ß thirΣ-part∙ releasσ i≤ no⌠ ì
  1563. requested«  Iµ thσ 3rdPt∙ bi⌠ i≤ one¼ anΣ iµ thσ reservatioε wa≤ madσ usinτ ß ì
  1564. thirΣ-part∙ reservatioε b∙ thσ initiato≥ tha⌠ i≤ requestinτ thσ releasσ fo≥ ì
  1565. thσ samσ SCS╔ devicσ a≤ specifieΣ iε thσ thirΣ-part∙ devicσ ID¼ theε thσ ì
  1566. targe⌠ shal∞ releasσ thσ reservation.
  1567.  
  1568. ááIµ thσ 3rdPt∙ bi⌠ i≤ one¼ thσ targe⌠ shal∞ no⌠ modif∙ thσ modσ parameter≤ ì
  1569. fo≥ command≤ receiveΣ froφ thσ thirΣ-part∙ devicσ eveε iµ thσ targe⌠ ì
  1570. implement≤ thσ transfe≥ oµ modσ parameter≤ witΦ ß thirΣ-part∙ RESERV┼ UNI╘ ì
  1571. command.
  1572.  
  1573. .cp 9è.lm 3
  1574. ááIMPLEMENTOR╙ NOTE║  Wheε ß targe⌠ implement≤ independen⌠ storagσ oµ modσ ì
  1575. ááparameter≤ fo≥ eacΦ initiator¼ ß thirΣ-part∙ RESERV┼ UNI╘ commanΣ effect≤ ß ì
  1576. áátransfe≥ oµ thσ curren⌠ modσ parameters«  Thosσ se⌠ u≡ b∙ thσ initiato≥ oµ ì
  1577. ááthσ RESERV┼ UNI╘ arσ t∩ bσ se⌠ a≤ thσ modσ parameter≤ useΣ fo≥ command≤ froφ ì
  1578. ááthσ thirΣ-part∙ devicσ (usuall∙ ß cop∙ maste≥ device)«  ┴ uni⌠ attentioε ì
  1579. ááconditioε notifie≤ thσ thirΣ-part∙ devicσ oµ thσ changeΣ modσ parameters«  ┴ ì
  1580. áásuccessfu∞ thirΣ-part∙ RELEAS┼ UNI╘ commanΣ leave≤ thσ transferreΣ ì
  1581. ááparameter≤ intact«  Thσ thirΣ-part∙ devicσ caε issuσ MOD┼ SENS┼ anΣ MOD┼ ì
  1582. ááSELEC╘ command≤ t∩ quer∙ anΣ modif∙ thσ modσ parameters«   
  1583. .lm 1
  1584.  
  1585.  
  1586.  
  1587. .cp 25
  1588. .aw off
  1589. .pm 0
  1590. 9.2.10. RESERVE UNI╘ Command
  1591.  
  1592.                        Table 9-13: RESERVE UNI╘ Command
  1593.  
  1594. ==============================================================================
  1595.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1596. Byte |        |        |        |        |        |        |        |        |
  1597. ==============================================================================
  1598.  0   |                           Operation Code (16h)                        |
  1599. -----|-----------------------------------------------------------------------|
  1600.  1   | Logical Unit Number      | 3rdPty | Third Party Device ID    |Reserved|
  1601. -----|-----------------------------------------------------------------------|
  1602.  2   |                           ReserveΣ                                    |
  1603. -----|-----------------------------------------------------------------------|
  1604.  3   ⁿ                           Reserved                                    |
  1605. -----|-----------------------------------------------------------------------|
  1606.  4   |                           Reserved                                    |
  1607. -----|-----------------------------------------------------------------------|
  1608.  5   |                           Control                                     |
  1609. ==============================================================================
  1610. .aw on
  1611. .pm 3
  1612.  
  1613.  
  1614. ááThσ RESERV┼ UNI╘ anΣ RELEAS┼ UNI╘ command≤ providσ thσ basiπ mechanisφ fo≥ ì
  1615. contentioε resolutioε iε multiplσ-initiato≥ systems«  Thσ RESERV┼ UNI╘ commanΣ ì
  1616. (Tablσ ╣-13⌐ i≤ useΣ t∩ reservσ logica∞ unit≤ fo≥ thσ exclusivσ usσ oµ thσ ì
  1617. requestinτ initiator¼ o≥ iµ i⌠ i≤ ß thirΣ-part∙ reservation¼ t∩ anothe≥ ì
  1618. specifieΣ SCS╔ device«  
  1619.  
  1620. ááThi≤ commanΣ request≤ tha⌠ thσ entirσ logica∞ uni⌠ bσ reserveΣ fo≥ thσ ì
  1621. exclusivσ usσ oµ thσ initiato≥ unti∞ thσ reservatioε i≤ supersedeΣ b∙ anothe≥ ì
  1622. valiΣ RESERV┼ UNI╘ commanΣ froφ thσ initiato≥ tha⌠ madσ thσ reservatioε o≥ ì
  1623. unti∞ releaseΣ b∙ ß RELEAS┼ UNI╘ commanΣ froφ thσ samσ initiato≥ tha⌠ madσ thσ ì
  1624. reservation¼ b∙ ß BU╙ DEVIC┼ RESE╘ messagσ froφ an∙ initiator¼ b∙ ß harΣ rese⌠ ì
  1625. condition¼ o≥ b∙ ß powe≥ oε cycle«  Thσ reservatioε shal∞ no⌠ bσ granteΣ iµ ì
  1626. thσ logica∞ uni⌠ i≤ reserveΣ b∙ anothe≥ initiator«  I⌠ shal∞ bσ permissiblσ ì
  1627. fo≥ aε initiato≥ t∩ reservσ ß logica∞ uni⌠ tha⌠ i≤ currentl∙ reserveΣ b∙ tha⌠ ì
  1628. initiator.
  1629.  
  1630. .cp 2
  1631. ááIµ thσ logica∞ uni⌠ i≤ reserveΣ fo≥ anothe≥ initiator¼ thσ targe⌠ shal∞ ì
  1632. returε RESERVATIO╬ CONFLIC╘ status«  
  1633.  
  1634. .cp 4èááIf¼ afte≥ honorinτ thσ reservation¼ an∙ othe≥ initiato≥ attempt≤ t∩ perforφ ì
  1635. an∙ commanΣ oε thσ reserveΣ logica∞ uni⌠ othe≥ thaε aε INQUIRY¼ REQUES╘ SENSE¼ ì
  1636. ALLO╫ MEDIU═ REMOVAL¼ RESERVE¼ o≥ ß RELEAS┼ UNI╘ command¼ thσ commanΣ shal∞ bσ ì
  1637. rejecteΣ witΦ RESERVATIO╬ CONFLIC╘ status« 
  1638.  
  1639.  
  1640. .aw off
  1641. .pm 0
  1642. .cp 10
  1643. 9.2.10.1. ThirΣ-Part∙ Reservatioε
  1644. .pm 3
  1645. .aw on
  1646. ááThirΣ-part∙ reservatioε allow≤ aε initiato≥ t∩ reservσ ß logica∞ uni⌠ fo≥ ì
  1647. anothe≥ SCS╔ device«  Thi≤ i≤ intendeΣ fo≥ usσ iε multiplσ-initiato≥ system≤ ì
  1648. tha⌠ usσ thσ COP┘ command«  
  1649.  
  1650. ááIµ thσ thirΣ-part∙ (3rdPty⌐ bi⌠ i≤ zero¼ ß thirΣ-part∙ reservatioε i≤ no⌠ ì
  1651. requested«  Iµ thσ 3rdPt∙ bi⌠ i≤ onσ thσ targe⌠ shal∞ reservσ thσ logica∞ uni⌠ ì
  1652. fo≥ thσ SCS╔ devicσ specifieΣ iε thσ thirΣ-part∙ devicσ I─ field« Thσ targe⌠ ì
  1653. shal∞ preservσ thσ reservatioε unti∞ i⌠ i≤ supersedeΣ b∙ anothe≥ valiΣ RESERV┼ ì
  1654. UNI╘ commanΣ froφ thσ initiato≥ tha⌠ madσ thσ reservatioε o≥ unti∞ i⌠ i≤ ì
  1655. releaseΣ b∙ thσ samσ initiator¼ b∙ ß BU╙ DEVIC┼ RESE╘ messagσ froφ an∙ ì
  1656. initiator¼ o≥ ß harΣ rese⌠ condition«  Thσ targe⌠ shal∞ ignorσ an∙ attemp⌠ t∩ ì
  1657. releasσ thσ reservatioε madσ b∙ an∙ othe≥ initiator.
  1658.  
  1659. ááIµ independen⌠ set≤ oµ parameter≤ arσ implemented¼ ß thirΣ part∙ reservatioε ì
  1660. shal∞ causσ thσ targe⌠ t∩ transfe≥ thσ se⌠ oµ parameter≤ iε effec⌠ fo≥ thσ ì
  1661. initiato≥ oµ thσ RESERV┼ commanΣ t∩ thσ parameter≤ useΣ fo≥ command≤ froφ thσ ì
  1662. thirΣ part∙ device«  An∙ subsequen⌠ commanΣ issueΣ b∙ thσ thirΣ-part∙ devicσ ì
  1663. i≤ executeΣ accordinτ t∩ thσ modσ parameter≤ iε effec⌠ fo≥ thσ initiato≥ tha⌠ ì
  1664. sen⌠ thσ RESERV┼ command.
  1665.  
  1666. ááIµ independen⌠ set≤ oµ parameter≤ arσ implemented¼ ß thirΣ part∙ reservatioε ì
  1667. shal∞ causσ thσ targe⌠ t∩ transfe≥ thσ se⌠ oµ parameter≤ iε effec⌠ fo≥ thσ ì
  1668. initiato≥ oµ thσ RESERV┼ commanΣ t∩ thσ parameter≤ useΣ fo≥ command≤ froφ thσ ì
  1669. thirΣ part∙ device«  An∙ subsequen⌠ commanΣ issueΣ b∙ thσ thirΣ-part∙ devicσ ì
  1670. i≤ executeΣ accordinτ t∩ thσ modσ parameter≤ iε effec⌠ fo≥ thσ initiato≥ tha⌠ ì
  1671. sen⌠ thσ RESERV┼ command.
  1672.  
  1673. .lm 3
  1674. ááIMPLEMENTOR╙ NOTE║  Thi≤ transfe≥ oµ thσ modσ parameter≤ i≤ applicablσ t∩ ì
  1675. áátarge⌠ device≤ whicΦ storσ modσ informatioε independentl∙ fo≥ differen⌠ ì
  1676. ááinitiators«  Thi≤ mechanisφ allow≤ aε initiato≥ t∩ se⌠ thσ modσ parameter≤ ì
  1677. ááoµ ß targe⌠ fo≥ thσ usσ oµ ß cop∙ maste≥ (i.e.¼ thσ thirΣ-part∙ device)«  ì
  1678. ááThσ thirΣ-part∙ cop∙ maste≥ ma∙ subsequentl∙ issuσ ß MOD┼ SELEC╘ commanΣ t∩ ì
  1679. áámodif∙ thσ modσ parameters.
  1680. .lm 1
  1681.  
  1682. .cp 10
  1683. .aw off
  1684. .pm 0
  1685. 9.2.10.2. Supersedinτ Reservation≤
  1686. .pm 3
  1687. .aw on
  1688. ááAε initiato≥ tha⌠ currentl∙ ha≤ ß logica∞ uni⌠ reserveΣ ma∙ modif∙ thσ ì
  1689. curren⌠ reservatioε b∙ issuinτ anothe≥ RESERV┼ UNI╘ commanΣ t∩ thσ samσ ì
  1690. logica∞ unit«  Thσ supersedinτ reservatioε shal∞ releasσ thσ curren⌠ ì
  1691. reservatioε iµ thσ supersedinτ reservatioε reques⌠ i≤ granted«  Thσ curren⌠ ì
  1692. reservatioε shal∞ no⌠ bσ modifieΣ iµ thσ supersedinτ reservatioε reques⌠ ì
  1693. canno⌠ bσ granted«  Iµ thσ supersedinτ reservatioε canno⌠ bσ granteΣ becausσ ì
  1694. oµ conflict≤ witΦ ß previou≤ reservatioε (othe≥ thaε thσ curren⌠ reservation)¼ ì
  1695. theε thσ targe⌠ shal∞ returε RESERVATIO╬ CONFLIC╘ status«  
  1696.  
  1697. .cp 4
  1698. .lm 3
  1699. ááIMPLEMENTOR╙ NOTE║  Supersedinτ reservation≤ allo≈ thσ SCS╔ devicσ I─ t∩ bσ ì
  1700. ááchangeΣ oε ß reservatioε usinτ thσ thirΣ-part∙ reservatioε option«  Thi≤ ì
  1701. áácapabilit∙ i≤ necessar∙ fo≥ certaiε situation≤ wheε usinτ COMPARE¼ COPY¼ anΣ ì
  1702. ááCOP┘ AN─ VERIF┘ commands.è.lm 1
  1703.  
  1704. .cp 25
  1705. .aw off
  1706. .pm 0
  1707. 9.2.11. REWIND Command
  1708.  
  1709.                           Table 9-14: REWIND Command
  1710.  
  1711. ==============================================================================
  1712.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1713. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1714. ==============================================================================
  1715.  0   |                           Operation Code (01h)                        |
  1716. -----|-----------------------------------------------------------------------|
  1717.  1   |   Logical Unit Number    |              ReserveΣ             | Immed  |
  1718. -----|-----------------------------------------------------------------------|
  1719.  2   |                           Reserved                                    |
  1720. -----|-----------------------------------------------------------------------|
  1721.  3   |                           Reserved                                    |
  1722. -----|-----------------------------------------------------------------------|
  1723.  4   |                           Reserved                                    |
  1724. -----|-----------------------------------------------------------------------|
  1725.  ╡   ⁿ                           Control                                     |
  1726. ==============================================================================
  1727. .aw on
  1728. .pm 3
  1729.  
  1730.  
  1731. .cp 4
  1732. ááThσ REWIN─ commanΣ (Tablσ ╣-14⌐ cause≤ thσ targe⌠ t∩ positioε thσ logica∞ ì
  1733. uni⌠ t∩ thσ beginninτ-oµ-partitioε iε thσ curren⌠ partition«  Prio≥ t∩ ì
  1734. performinτ thσ rewinΣ operation¼ thσ targe⌠ shal∞ ensurσ tha⌠ al∞ buffereΣ ì
  1735. data¼ filemarks¼ anΣ setmark≤ havσ beeε transferreΣ t∩ thσ medium.
  1736.  
  1737. .cp 7
  1738. ááAε immediatσ (Immed⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ returε ì
  1739. statu≤ unti∞ thσ rewinΣ operatioε ha≤ completed«  Aε ImmeΣ bi⌠ oµ onσ ì
  1740. indicate≤ tha⌠ thσ targe⌠ shal∞ returε statu≤ a≤ sooε a≤ al∞ buffereΣ command≤ ì
  1741. havσ completeΣ executioε anΣ thσ commanΣ descripto≥ blocδ oµ thσ REWIN─ ì
  1742. commanΣ ha≤ beeε validated«  Iµ CHEC╦ CONDITIO╬ statu≤ i≤ returneΣ fo≥ ß ì
  1743. REWIN─ commanΣ witΦ aε ImmeΣ bi⌠ oµ one¼ thσ rewinΣ operatioε shal∞ no⌠ bσ ì
  1744. performed.
  1745.  
  1746. .cp 5
  1747. .lm 3
  1748. ááIMPLEMENTOR╙ NOTE║  Fo≥ compatibilit∙ witΦ device≤ implementeΣ prio≥ t∩ thi≤ ì
  1749. áástandard¼ i⌠ i≤ suggesteΣ tha⌠ ß WRIT┼ FILEMARK╙ commanΣ witΦ aε ImmeΣ bi⌠ ì
  1750. ááoµ zer∩ bσ useΣ t∩ ensurσ tha⌠ al∞ buffereΣ data¼ filemarks¼ o≥ setmark≤ ì
  1751. ááhavσ beeε transferreΣ t∩ thσ mediuφ beforσ issuinτ ß REWIN─ commanΣ witΦ aε ì
  1752. ááImmeΣ bi⌠ oµ one.
  1753. .lm 1
  1754.  
  1755. .cp 4
  1756. ááWheε operatinτ iε buffereΣ modσ 1Φ o≥ 2Φ (seσ 9.3.3)¼ thσ targe⌠ shal∞ ì
  1757. discarΣ an∙ unwritteε buffereΣ datß afte≥ thσ REWIN─ commanΣ i≤ validateΣ iµ ì
  1758. thσ previou≤ commanΣ wa≤ terminateΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ devicσ ì
  1759. i≤ unablσ t∩ continuσ successfull∙ writing« 
  1760.  
  1761. .cp 25è.aw off
  1762. .pm 0
  1763. 9.2.12. SPACE Command
  1764.  
  1765.                           Table 9-15: SPACE Command
  1766.  
  1767. ==============================================================================
  1768.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1769. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1770. ==============================================================================
  1771.  0   |                           Operation  (11h)                            |
  1772. -----|-----------------------------------------------------------------------|
  1773.  ▒   ⁿ   Logica∞ Uni⌠ Numbe≥    |     ReserveΣ    ⁿ           Codσ           |
  1774. -----|-----------------------------------------------------------------------|
  1775.  2   | (MSB)                                                                 |
  1776. -----|---                                                                 ---|
  1777.  3   |                           Count                                       |
  1778. -----|---                                                                 ---|
  1779.  4   |                                                                 (LSB) |
  1780. -----|-----------------------------------------------------------------------|
  1781.  ╡   ⁿ                           Control                                     |
  1782. ==============================================================================
  1783. .aw on
  1784. .pm 3
  1785.  
  1786.  
  1787. .cp 6
  1788. ááThσ SPAC┼ commanΣ (Tablσ ╣-15⌐ provide≤ ß variet∙ oµ positioninτ function≤ ì
  1789. tha⌠ arσ determineΣ b∙ thσ codσ anΣ count«  BotΦ forwarΣ anΣ reversσ ì
  1790. positioninτ arσ provided¼ althougΦ somσ target≤ ma∙ onl∙ suppor⌠ ß subse⌠ oµ ì
  1791. thi≤ command«  Iµ aε initiato≥ request≤ aε unsupporteΣ function¼ thσ commanΣ ì
  1792. shal∞ bσ terminateΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ sensσ ke∙ shal∞ bσ se⌠ ì
  1793. t∩ ILLEGA╠ REQUEST.
  1794.  
  1795. .cp 11
  1796. ááThσ codσ i≤ defineΣ a≤ follows:
  1797.  
  1798. .pm 0
  1799. .aw off
  1800.                    Code         Description          Support
  1801.                  ---------  --------------------    ---------
  1802.                    000b     Blocks                  Mandatory
  1803.                    001b     Filemarks               Mandatory
  1804.                    010b     Sequential Filemarks    Optional
  1805.                    011b     ┼nd-of-Data             Optional
  1806.                    100b     Setmark≤                Optional
  1807.                    101b     Sequentia∞ Setmark≤     Optional
  1808.                  110b-111b  Reserved
  1809. .aw on
  1810. .pm 3
  1811.  
  1812. .cp 10
  1813. ááWheε spacinτ ove≥ blocks¼ filemarks¼ o≥ setmarks¼ thσ coun⌠ fielΣ specifie≤ ì
  1814. thσ numbe≥ oµ blocks¼ filemarks¼ o≥ setmark≤ t∩ bσ spaceΣ ove≥ iε thσ curren⌠ ì
  1815. partition«  ┴ positivσ valuσ ╬ iε thσ coun⌠ fielΣ shal∞ causσ forwarΣ ì
  1816. positioninτ (towarΣ enΣ-oµ-partition⌐ ove≥ ╬ blocks¼ filemarks¼ o≥ setmark≤ ì
  1817. endinτ oε thσ enΣ-oµ-partitioε sidσ oµ thσ las⌠ block¼ filemark¼ o≥ setmark«  ì
  1818. ┴ zer∩ valuσ iε thσ coun⌠ fielΣ shal∞ causσ n∩ changσ oµ logica∞ position«  ┴ ì
  1819. negativσ valuσ -╬ (two'≤ complemen⌠ notation⌐ iε thσ coun⌠ fielΣ shal∞ causσ ì
  1820. reversσ positioninτ (towarΣ beginninτ-oµ-partition⌐ ove≥ ╬ blocks¼ filemarks¼ ì
  1821. o≥ setmark≤ endinτ oε thσ beginninτ-oµ-partitioε sidσ oµ thσ las⌠ block¼ ì
  1822. filemark¼ o≥ setmark«  Suppor⌠ oµ spacinτ iε thσ reversσ directioε i≤ ì
  1823. optional« 
  1824.  
  1825. .cp 9èááIµ ß filemarδ i≤ encountereΣ whilσ spacinτ ove≥ blocks¼ thσ commanΣ shal∞ bσ ì
  1826. terminated«  Thσ logica∞ positioε shal∞ bσ oε thσ enΣ-oµ-partitioε sidσ oµ thσ ì
  1827. filemarδ iµ movemen⌠ wa≤ iε thσ forwarΣ directioε anΣ oε thσ beginninτ-oµ-ì
  1828. partitioε sidσ oµ thσ filemarδ iµ movemen⌠ wa≤ iε thσ reversσ direction«  ì
  1829. CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returneΣ t∩ thσ initiator¼ thσ sensσ ke∙ shal∞ ì
  1830. bσ se⌠ t∩ N╧ SENSE¼ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ ì
  1831. sensσ data«  Thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ coun⌠ minu≤ ì
  1832. thσ actua∞ numbe≥ oµ block≤ spaceΣ ove≥ (no⌠ includinτ thσ filemark).
  1833.  
  1834. .cp 13
  1835. ááIµ ß setmarδ i≤ encountereΣ whilσ spacinτ ove≥ block≤ o≥ filemark≤ anΣ thσ ì
  1836. RSmδ bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ (9.3.3.1)¼ thσ commanΣ ì
  1837. shal∞ bσ terminated¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returneΣ t∩ thσ ì
  1838. initiator¼ anΣ thσ filemarδ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ ì
  1839. data«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ anΣ thσ additiona∞ sensσ codσ ì
  1840. shal∞ bσ se⌠ t∩ SETMAR╦ DETECTED«  Thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ ì
  1841. requesteΣ coun⌠ minu≤ thσ actua∞ numbe≥ oµ block≤ o≥ filemark≤ spaceΣ ove≥ ì
  1842. (no⌠ includinτ thσ setmark)«  Thσ logica∞ positioε shal∞ bσ oε thσ enΣ-oµ-ì
  1843. partitioε sidσ oµ thσ setmarδ iµ movemen⌠ wa≤ iε thσ forwarΣ directioε anΣ oε ì
  1844. thσ beginninτ-oµ-partitioε sidσ oµ thσ setmarδ iµ movemen⌠ wa≤ iε thσ reversσ ì
  1845. direction«  Thσ targe⌠ shal∞ no⌠ returε CHEC╦ CONDITIO╬ statu≤ wheε ß setmarδ ì
  1846. i≤ encountereΣ iµ thσ RSmδ bi⌠ i≤ se⌠ t∩ zer∩ o≥ iµ thi≤ optioε i≤ no⌠ ì
  1847. supported.
  1848.  
  1849. .cp 9
  1850. ááIµ earl∙-warninτ i≤ encountereΣ whilσ spacinτ ove≥ blocks¼ filemarks¼ o≥ ì
  1851. setmark≤ anΣ thσ RE╫ bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ ì
  1852. (9.3.3.1)¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ ì
  1853. se⌠ t∩ N╧ SENSE¼ anΣ thσ EO═ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ ì
  1854. data«  Thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ coun⌠ minu≤ thσ ì
  1855. actua∞ numbe≥ oµ blocks¼ filemarks¼ o≥ setmark≤ spaceΣ ove≥ a≤ defineΣ b∙ thσ ì
  1856. codσ value«  Iµ thσ RE╫ bi⌠ i≤ zer∩ o≥ thσ optioε i≤ no⌠ supporteΣ b∙ thσ ì
  1857. target¼ thσ targe⌠ shal∞ no⌠ repor⌠ CHEC╦ CONDITIO╬ statu≤ a⌠ thσ earl∙-ì
  1858. warninτ point.
  1859.  
  1860. .cp 2
  1861. .lm 3
  1862. ááIMPLEMENTOR╙ NOTE║  Settinτ thσ RE╫ bi⌠ i≤ no⌠ recommendeΣ fo≥ mos⌠ systeφ ì
  1863. ááapplication≤ sincσ datß ma∙ bσ presen⌠ afte≥ earl∙-warning.
  1864. .lm 1
  1865.  
  1866. .cp 7
  1867. ááIµ enΣ-oµ-datß i≤ encountereΣ whilσ spacinτ ove≥ blocks¼ filemarks¼ o≥ ì
  1868. setmarks¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ ì
  1869. t∩ BLAN╦ CHECK¼ anΣ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  ì
  1870. Additionally¼ thσ EO═ bi⌠ shal∞ bσ se⌠ t∩ onσ iµ enΣ-oµ-datß i≤ encountereΣ a⌠ ì
  1871. o≥ afte≥ earl∙-warning«  Thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  1872. coun⌠ minu≤ thσ actua∞ numbe≥ oµ blocks¼ filemarks¼ o≥ setmark≤ spaceΣ ove≥ a≤ ì
  1873. defineΣ b∙ thσ codσ value.
  1874.  
  1875. .cp 5
  1876. ááIµ thσ enΣ-oµ-partitioε i≤ encountereΣ whilσ spacinτ forwarΣ ove≥ blocks¼ ì
  1877. filemarks¼ o≥ setmarks¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ì
  1878. ke∙ shal∞ bσ se⌠ t∩ MEDIU═ ERROR¼ thσ EO═ bi⌠ shal∞ bσ se⌠ t∩ one¼ anΣ thσ ì
  1879. valiΣ bi⌠ shal∞ bσ se⌠ t∩ one«  Thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ ì
  1880. requesteΣ coun⌠ minu≤ thσ actua∞ numbe≥ oµ blocks¼ filemarks¼ o≥ setmark≤ ì
  1881. spaceΣ ove≥ a≤ defineΣ b∙ thσ codσ value.
  1882.  
  1883. .cp 6èááIµ beginninτ-oµ-partitioε i≤ encountereΣ whilσ spacinτ ove≥ blocks¼ ì
  1884. filemarks¼ o≥ setmark≤ iε thσ reversσ direction¼ thσ targe⌠ shal∞ returε CHEC╦ ì
  1885. CONDITIO╬ statu≤ anΣ shal∞ se⌠ thσ sensσ ke∙ t∩ N╧ SENSE«  Thσ EO═ anΣ valiΣ ì
  1886. bit≤ shal∞ bσ se⌠ t∩ one¼ anΣ thσ informatioε fielΣ se⌠ t∩ thσ tota∞ numbe≥ oµ ì
  1887. blocks¼ filemarks¼ o≥ setmark≤ no⌠ spaceΣ ove≥ (thσ requesteΣ numbe≥ oµ ì
  1888. blocks¼ filemarks¼ o≥ setmark≤ minu≤ thσ actua∞ numbe≥ oµ blocks¼ filemarks¼ ì
  1889. o≥ setmark≤ spaceΣ over).
  1890.  
  1891. .cp 11
  1892. ááWheε spacinτ ove≥ sequentia∞ filemark≤ (o≥ setmarks)¼ thσ coun⌠ fielΣ i≤ ì
  1893. interpreteΣ a≤ follows:
  1894. .lm 3
  1895. áá(1⌐ ┴ positivσ valuσ ╬ shal∞ causσ forwarΣ movemen⌠ t∩ thσ firs⌠ occurrencσ ì
  1896. ááoµ ╬ o≥ morσ consecutivσ filemark≤ (o≥ setmarks⌐ beinτ logicall∙ positioneΣ ì
  1897. ááafte≥ thσ Nthö filemarδ (o≥ setmark).
  1898. áá(2⌐ ┴ zer∩ valuσ shal∞ causσ n∩ changσ iε thσ logica∞ position.
  1899. áá(3⌐ ┴ negativσ valuσ -╬ (2'≤ complemen⌠ notation⌐ shal∞ causσ reversσ ì
  1900. áámovemen⌠ t∩ thσ firs⌠ occurrencσ oµ ╬ o≥ morσ consecutivσ filemark≤ (o≥ ì
  1901. áásetmarks⌐ beinτ logicall∙ positioneΣ oε thσ beginninτ-oµ-partitioε sidσ oµ ì
  1902. ááthσ Nthö filemarδ (o≥ setmark).
  1903. .lm 1
  1904.  
  1905. .cp 7
  1906. ááIµ ß setmarδ i≤ encountereΣ whilσ spacinτ t∩ sequentia∞ filemark≤ anΣ thσ ì
  1907. RSmδ bi⌠ i≤ se⌠ t∩ onσ iε thσ devicσ configuratioε pagσ (9.3.3.1)¼ CHEC╦ ì
  1908. CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ filemarδ bi⌠ shal∞ bσ se⌠ t∩ one¼ anΣ ì
  1909. thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ zero«  Thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ ì
  1910. anΣ thσ additiona∞ sensσ codσ shal∞ bσ se⌠ t∩ SETMAR╦ DETECTED«  Thσ targe⌠ ì
  1911. shal∞ no⌠ returε CHEC╦ CONDITIO╬ statu≤ wheε ß setmarδ i≤ encountereΣ iµ thσ ì
  1912. RSmδ bi⌠ i≤ se⌠ t∩ zer∩ o≥ iµ thi≤ optioε i≤ no⌠ supported.
  1913.  
  1914. .cp 4
  1915. ááIµ enΣ-oµ-partitioε i≤ encountereΣ whilσ spacinτ t∩ sequentia∞ filemark≤ o≥ ì
  1916. setmarks¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ ì
  1917. t∩ MEDIU═ ERROR¼ thσ EO═ bi⌠ shal∞ bσ se⌠ t∩ one¼ anΣ thσ valiΣ bi⌠ shal∞ bσ ì
  1918. se⌠ t∩ zero.
  1919.  
  1920. .cp 4
  1921. ááIµ enΣ-oµ-datß i≤ encountereΣ whilσ spacinτ t∩ sequentia∞ filemark≤ o≥ ì
  1922. setmarks¼ CHEC╦ CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ ì
  1923. t∩ BLAN╦ CHECK¼ anΣ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ zero«  Additionally¼ thσ EO═ ì
  1924. bi⌠ shal∞ bσ se⌠ t∩ onσ iµ enΣ-oµ-datß i≤ encountereΣ a⌠ o≥ afte≥ earl∙-ì
  1925. warning.
  1926.  
  1927. .cp 3
  1928. ááWheε spacinτ t∩ enΣ-oµ-data¼ thσ coun⌠ fielΣ i≤ ignored«  Upoε successfu∞ ì
  1929. completion¼ thσ mediuφ shal∞ bσ positioneΣ sucΦ tha⌠ ß subsequen⌠ writσ ì
  1930. operatioε woulΣ appenΣ t∩ thσ las⌠ logicall∙ recordeΣ information.
  1931.  
  1932. .cp 3
  1933. ááIµ enΣ-oµ-partitioε i≤ encountereΣ whilσ spacinτ t∩ enΣ-oµ-data¼ CHEC╦ ì
  1934. CONDITIO╬ statu≤ shal∞ bσ returned¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ MEDIU═ ì
  1935. ERROR¼ thσ EO═ bi⌠ shal∞ bσ se⌠ t∩ one¼ anΣ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ ì
  1936. zero.
  1937.  
  1938. .cp 25è.aw off
  1939. .pm 0
  1940. 9.2.13. VERIFY Command
  1941.  
  1942.                           Table 9-16: VERIFY Command
  1943.  
  1944. ==============================================================================
  1945.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  1946. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  1947. ==============================================================================
  1948.  0   |                           Operation Code (13h)                        |
  1949. -----|-----------------------------------------------------------------------|
  1950.  1   ⁿ   Logica∞ Uni⌠ Numbe≥    ⁿ    ReserveΣ     ⁿ ImmeΣ  ⁿ BytCm≡ ⁿ FixeΣ  |
  1951. -----|-----------------------------------------------------------------------|
  1952.  2   | (MSB)                                                                 |
  1953. -----|---                                                                 ---|
  1954.  3   |                           Verification Length                         |
  1955. -----|---                                                                 ---|
  1956.  4   |                                                                 (LSB) |
  1957. -----|-----------------------------------------------------------------------|
  1958.  5   ⁿ                           Control                                     |
  1959. ==============================================================================
  1960. .aw on
  1961. .pm 3
  1962.  
  1963.  
  1964. .cp 2
  1965. ááThσ VERIF┘ commanΣ (Tablσ ╣-16⌐ request≤ tha⌠ thσ targe⌠ verif∙ onσ o≥ morσ ì
  1966. block(s⌐ beginninτ witΦ thσ nex⌠ blocδ oε thσ logica∞ unit.
  1967.  
  1968. .cp 5
  1969. ááAε immediatσ (Immed⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ commanΣ shal∞ no⌠ returε ì
  1970. statu≤ unti∞ thσ verif∙ operatioε ha≤ completed«  Aε ImmeΣ bi⌠ oµ onσ ì
  1971. indicate≤ tha⌠ statu≤ shal∞ bσ returneΣ a≤ sooε a≤ thσ commanΣ descripto≥ ì
  1972. blocδ ha≤ beeε validateΣ (bu⌠ afte≥ thσ datß transfe≥ froφ thσ initiator¼ iµ ì
  1973. thσ BytCm≡ bi⌠ i≤ one)«  
  1974.  
  1975. .cp 3
  1976. .lm 3
  1977. ááIMPLEMENTOR╙ NOTE║ Iε orde≥ t∩ ensurσ tha⌠ n∩ error≤ arσ lost¼ thσ initiato≥ ì
  1978. ááshoulΣ se⌠ thσ ImmeΣ bi⌠ t∩ zer∩ oε thσ las⌠ VERIF┘ commanΣ wheε issuinτ ß ì
  1979. ááserie≤ oµ VERIF┘ commands.
  1980. .lm 1  
  1981.  
  1982. .cp 3
  1983. áá┴ bytσ comparσ (BytCmp⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ verificatioε shal∞ bσ ì
  1984. simpl∙ ß mediuφ verificatioε (e.g.¼ CRC¼ ECC)«  N∩ datß shal∞ bσ transferreΣ ì
  1985. betweeε thσ initiato≥ anΣ target.
  1986.  
  1987. .cp 7
  1988. áá┴ BytCm≡ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ perforφ ß bytσ-b∙-bytσ ì
  1989. comparσ oµ thσ datß oε thσ mediuφ anΣ thσ datß transferreΣ froφ thσ initiato≥ ì
  1990. durinτ thσ DAT┴ OU╘ phasσ oµ thσ VERIF┘ command«  Datß shal∞ bσ transferreΣ ì
  1991. froφ thσ initiato≥ t∩ thσ targe⌠ a≤ iε ß WRIT┼ command«  Iµ thσ BytCm≡ bi⌠ i≤ ì
  1992. onσ anΣ thσ bytσ comparσ optioε i≤ no⌠ supported¼ thσ targe⌠ shal∞ terminatσ ì
  1993. thσ commanΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ ì
  1994. ILLEGA╠ REQUEST.
  1995.  
  1996. .cp 6
  1997. ááThσ verificatioε lengtΦ specifie≤ thσ amoun⌠ oµ datß t∩ verify¼ iε block≤ o≥ ì
  1998. bytes¼ a≤ indicateΣ b∙ thσ fixeΣ bit« Refe≥ t∩ thσ REA─ commanΣ (9.2.4⌐ fo≥ ß ì
  1999. descriptioε oµ thσ fixeΣ bi⌠ anΣ an∙ associateΣ erro≥ conditions« Wheε thσ ì
  2000. verificatioε lengtΦ i≤ zero¼ n∩ datß shal∞ bσ verifieΣ anΣ thσ curren⌠ logica∞ ì
  2001. positioε shal∞ no⌠ bσ changed«  Thi≤ conditioε shal∞ no⌠ bσ considereΣ a≤ aε ì
  2002. error.
  2003.  
  2004. .cp 10èááThσ VERIF┘ commanΣ shal∞ terminatσ wheε thσ verificatioε lengtΦ ha≤ beeε ì
  2005. satisfied¼ wheε aε incorrec⌠ lengtΦ blocδ i≤ encountered¼ wheε ß filemarδ i≤ ì
  2006. encountered¼ wheε ß setmarδ i≤ encountereΣ (iµ thσ RSmδ bi⌠ i≤ onσ iε thσ ì
  2007. devicσ configuratioε page¼ 9.3.3.1)¼ wheε enΣ-oµ-datß i≤ encountered¼ wheε thσ ì
  2008. enΣ-oµ-partitioε i≤ encountered¼ wheε earl∙-warninτ i≤ encountereΣ (iµ thσ RE╫ ì
  2009. bi⌠ i≤ onσ iε thσ devicσ configuratioε page¼ 9.3.3.1)¼ o≥ wheε aε ì
  2010. unrecoverablσ reaΣ erro≥ i≤ encountered«  Thσ statu≤ anΣ sensσ datß fo≥ eacΦ ì
  2011. oµ thesσ condition≤ arσ handleΣ iε thσ samσ manne≥ a≤ iε thσ REA─ commanΣ ì
  2012. (9.2.4)«  Upoε successfu∞ completioε oµ ß VERIF┘ command¼ thσ logica∞ positioε ì
  2013. shal∞ bσ afte≥ thσ las⌠ blocδ verified.
  2014.  
  2015. .cp 11
  2016. ááIµ thσ datß doe≤ no⌠ comparσ (BytCm≡ bi⌠ oµ one)¼ thσ commanΣ shal∞ ì
  2017. terminatσ witΦ CHEC╦ CONDITIO╬ status¼ thσ valiΣ bi⌠ shal∞ bσ se⌠ t∩ one¼ anΣ ì
  2018. thσ sensσ ke∙ shal∞ bσ se⌠ t∩ MISCOMPARE«  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ ì
  2019. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ verificatioε lengtΦ minu≤ thσ ì
  2020. actua∞ numbe≥ oµ block≤ successfull∙ verified«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ ì
  2021. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ verificatioε lengtΦ minu≤ thσ ì
  2022. actua∞ numbe≥ oµ byte≤ successfull∙ verified«  Thi≤ numbe≥ ma∙ bσ large≥ thaε ì
  2023. thσ requesteΣ verificatioε lengtΦ iµ thσ erro≥ occurreΣ oε ß previou≤ VERIF┘ ì
  2024. commanΣ witΦ aε ImmeΣ bi⌠ oµ one«  Upoε termination¼ thσ mediuφ shal∞ bσ ì
  2025. positioneΣ afte≥ thσ blocδ containinτ thσ miscomparσ (enΣ-oµ-partitioε side).
  2026.  
  2027.  
  2028. .cp 26
  2029. .aw off
  2030. .pm 0
  2031. 9.2.14. WRITE Command
  2032.  
  2033.                           Table 9-17: WRITE Command
  2034.  
  2035. ==============================================================================
  2036.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2037. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2038. ==============================================================================
  2039.  0   |                           Operation Code (0Ah)                        |
  2040. -----|-----------------------------------------------------------------------|
  2041.  1   |   Logical Unit Number    |              Reserved             | Fixed  |
  2042. -----|-----------------------------------------------------------------------|
  2043.  2   | (MSB)                                                                 |
  2044. -----|---                                                                 ---|
  2045.  3   |                           Transfer Length                             |
  2046. -----|---                                                                 ---|
  2047.  4   |                                                                 (LSB) |
  2048. -----|-----------------------------------------------------------------------|
  2049.  ╡   ⁿ                           Control                                     |
  2050. ==============================================================================
  2051. .aw on
  2052. .pm 3
  2053.  
  2054.  
  2055. .cp 2
  2056. ááThσ WRIT┼ commanΣ (Tablσ ╣-17⌐ request≤ tha⌠ thσ targe⌠ writσ thσ datß tha⌠ ì
  2057. i≤ transferreΣ froφ thσ initiato≥ t∩ thσ curren⌠ positioε oε thσ logica∞ unit« 
  2058.  
  2059. .cp 3
  2060. ááThσ fixeΣ bi⌠ specifie≤ whethe≥ fixeΣ-lengtΦ o≥ variablσ-lengtΦ block≤ arσ ì
  2061. t∩ bσ transferred«  Seσ thσ REA─ BLOC╦ LIMIT╙ commanΣ (9.2.5⌐ fo≥ additiona∞ ì
  2062. informatioε abou⌠ fixeΣ anΣ variablσ blocδ mode.
  2063.  
  2064. .cp 4èááIµ thσ fixeΣ bi⌠ i≤ one¼ thσ transfe≥ lengtΦ specifie≤ thσ numbe≥ oµ fixeΣ-ì
  2065. lengtΦ block≤ t∩ bσ transferred¼ usinτ thσ curren⌠ blocδ lengtΦ reporteΣ iε ì
  2066. thσ modσ paramete≥ blocδ descripto≥ (7.3.3)«  Iµ thσ fixeΣ bi⌠ i≤ zero¼ ß ì
  2067. singlσ blocδ i≤ transferreΣ witΦ thσ transfe≥ lengtΦ specifyinτ thσ blocδ ì
  2068. lengtΦ iε bytes.
  2069.  
  2070. .cp 3
  2071. ááIµ thσ transfe≥ lengtΦ i≤ zero¼ n∩ datß shal∞ bσ transferreΣ anΣ thσ curren⌠ ì
  2072. positioε oε thσ logica∞ uni⌠ shal∞ no⌠ bσ changed«  Thi≤ conditioε shal∞ no⌠ ì
  2073. bσ considereΣ aε error.
  2074.  
  2075. .cp 6
  2076. áá┴ WRIT┼ commanΣ ma∙ bσ buffereΣ o≥ unbuffered¼ a≤ indicateΣ b∙ thσ buffereΣ ì
  2077. modσ fielΣ oµ thσ modσ paramete≥ heade≥ (9.3.3)«  Fo≥ unbuffereΣ operatioε ì
  2078. (buffereΣ modσ 0h)¼ thσ targe⌠ shal∞ no⌠ returε GOO─ statu≤ unti∞ al∞ datß ì
  2079. block(s⌐ arσ successfull∙ writteε t∩ thσ medium«  Fo≥ buffereΣ operatioε ì
  2080. (buffereΣ modσ 1Φ o≥ 2h)¼ thσ targe⌠ ma∙ returε GOO─ statu≤ a≤ sooε a≤ al∞ ì
  2081. datß block(s⌐ arσ successfull∙ transferreΣ t∩ thσ target'≤ buffer.
  2082.  
  2083. .cp4
  2084. .lm3
  2085. ááIMPLEMENTOR╙ NOTE║  Fo≥ compatibilit∙ witΦ device≤ implementeΣ prio≥ t∩ thi≤ ì
  2086. ááversioε oµ thσ standard¼ ß WRIT┼ FILEMARK╙ commanΣ witΦ thσ ImmeΣ bi⌠ se⌠ t∩ ì
  2087. áázer∩ shoulΣ bσ issueΣ wheε completinτ ß buffereΣ writσ operatioε t∩ ensurσ ì
  2088. áátha⌠ al∞ buffereΣ data¼ filemarks¼ anΣ setmark≤ arσ writteε t∩ thσ medium.
  2089. .lm1
  2090.  
  2091. .cp 9
  2092. ááIµ thσ logica∞ uni⌠ encounter≤ earl∙-warninτ durinτ ß WRIT┼ command¼ aε ì
  2093. attemp⌠ t∩ finisΦ writinτ an∙ datß ma∙ bσ made¼ a≤ determineΣ b∙ thσ curren⌠ ì
  2094. setting≤ oµ thσ RE╫ anΣ SE╫ bit≤ iε thσ devicσ configuratioε pagσ (9.3.3.1)«  ì
  2095. Thσ commanΣ shal∞ terminatσ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ EO═ anΣ valiΣ ì
  2096. bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  Iµ al∞ datß tha⌠ i≤ t∩ bσ writteε ì
  2097. i≤ successfull∙ transferreΣ t∩ thσ medium¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ ì
  2098. SENS┼ o≥ RECOVERE─ ERROR¼ a≤ appropriate«  Iµ an∙ datß tha⌠ i≤ t∩ bσ writteε ì
  2099. canno⌠ bσ transferreΣ t∩ thσ mediuφ wheε earl∙-warninτ i≤ encountered¼ thσ ì
  2100. sensσ ke∙ shal∞ bσ se⌠ t∩ VOLUM┼ OVERFLOW.
  2101.  
  2102. ááThσ informatioε fielΣ shal∞ bσ defineΣ a≤ follows:
  2103. .cp 4
  2104. áá(1⌐  Iµ unbuffereΣ modσ i≤ reporteΣ iε thσ modσ paramete≥ heade≥ anΣ thσ ì
  2105. fixeΣ bi⌠ i≤ se⌠ t∩ one¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ ì
  2106. transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ written.
  2107. .cp 2
  2108. áá(2⌐  Iµ unbuffereΣ modσ i≤ reporteΣ anΣ thσ fixeΣ bi⌠ i≤ se⌠ t∩ zero¼ thσ ì
  2109. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ length.
  2110. .cp 6
  2111. áá(3⌐  Iµ buffereΣ modσ i≤ reporteΣ iε thσ modσ paramete≥ heade≥ anΣ thσ fixeΣ ì
  2112. bi⌠ i≤ se⌠ t∩ one¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ numbe≥ oµ ì
  2113. blocks¼ filemarks¼ anΣ setmark≤ no⌠ writteε (thσ numbe≥ oµ block≤ no⌠ ì
  2114. transferreΣ froφ thσ initiato≥ plu≤ thσ numbe≥ oµ blocks¼ filemarks¼ anΣ ì
  2115. setmark≤ remaininτ iε thσ target'≤ buffer)«  Notσ tha⌠ thσ valuσ iε thσ ì
  2116. informatioε fielΣ ma∙ exceeΣ thσ transfe≥ length.
  2117. .cp 6
  2118. áá(4⌐  Iµ buffereΣ modσ i≤ reporteΣ anΣ thσ fixeΣ bi⌠ i≤ se⌠ t∩ zero¼ thσ ì
  2119. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ numbe≥ oµ bytes¼ filemarks¼ anΣ ì
  2120. setmark≤ no⌠ writteε (thσ numbe≥ oµ byte≤ no⌠ transferreΣ froφ thσ initiato≥ ì
  2121. plu≤ thσ numbe≥ oµ bytes¼ filemarks¼ anΣ setmark≤ remaininτ iε thσ target'≤ ì
  2122. buffer)«  Notσ tha⌠ thσ valuσ iε thσ informatioε fielΣ ma∙ exceeΣ thσ transfe≥ ì
  2123. length.
  2124.  
  2125. .cp 3
  2126. .lm 3
  2127. ááIMPLEMENTOR╙ NOTE║  Thσ targe⌠ shoulΣ ensurσ tha⌠ somσ additiona∞ datß caε ì
  2128. áábσ writteε t∩ thσ mediuφ (e.g.¼ labels¼ filemarks¼ o≥ setmarks⌐ afte≥ thσ ì
  2129. ááfirs⌠ earl∙-warninτ indicatioε ha≤ beeε returneΣ t∩ thσ initiator.
  2130. .lm 1
  2131. è.cp 8
  2132. ááIµ ß WRIT┼ commanΣ i≤ receiveΣ whilσ thσ logica∞ uni⌠ i≤ positioneΣ betweeε ì
  2133. earl∙-warninτ anΣ enΣ-oµ-partition¼ thσ targe⌠ shal∞ returε CHEC╦ CONDITIO╬ ì
  2134. statu≤ afte≥ attemptinτ t∩ perforφ thσ command«  Thσ EO═ anΣ valiΣ bit≤ shal∞ ì
  2135. bσ se⌠ t∩ onσ iε thσ sensσ data«  Iµ al∞ datß tha⌠ i≤ t∩ bσ writteε i≤ ì
  2136. successfull∙ transferreΣ t∩ thσ medium¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ ì
  2137. zero«  Iµ an∙ datß tha⌠ i≤ t∩ bσ writteε i≤ no⌠ transferreΣ t∩ thσ mediuφ ì
  2138. prio≥ t∩ encounterinτ enΣ-oµ-partition¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ VOLUM┼ ì
  2139. OVERFLO╫ anΣ thσ informatioε fielΣ shal∞ bσ defineΣ a≤ follows:
  2140. .cp5
  2141. áá(1⌐  Iµ thσ fixeΣ bi⌠ i≤ one¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ ì
  2142. requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ block≤ writteε t∩ thσ ì
  2143. medium.
  2144. áá(2⌐  Iµ thσ fixeΣ bi⌠ i≤ zero¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ ì
  2145. requesteΣ transfe≥ length.
  2146. .lm 1
  2147.  
  2148. .lm3
  2149. ááIMPLEMENTOR╙ NOTE║  Iε somσ system≤ i⌠ i≤ importan⌠ t∩ recognizσ aε erro≥ iµ ì
  2150. ááenΣ-oµ-partitioε i≤ encountereΣ durinτ executioε oµ ß WRIT┼ command¼ withou⌠ ì
  2151. ááregarΣ fo≥ whethe≥ al∞ datß tha⌠ i≤ t∩ bσ writteε i≤ successfull∙ ì
  2152. áátransferreΣ t∩ thσ medium«  B∙ it≤ definition¼ thσ VOLUM┼ OVERFLO╫ sensσ ke∙ ì
  2153. ááma∙ alway≤ validl∙ bσ returneΣ iµ enΣ-oµ-partitioε i≤ encountereΣ whilσ ì
  2154. ááwriting¼ anΣ sucΦ usagσ i≤ recommended«  Reportinτ thσ MEDIU═ ERRO╥ sensσ ì
  2155. áákey¼ a≤ wa≤ donσ iε somσ SCS╔-▒ implementations¼ ma∙ causσ confusioε a≤ t∩ ì
  2156. ááwhethe≥ therσ wa≤ reall∙ defectivσ mediuφ encountereΣ durinτ executioε oµ ì
  2157. ááthσ las⌠ writσ command.
  2158. .lm1
  2159.  
  2160. .cp 25
  2161. .aw off
  2162. .pm 0
  2163. 9.2.15. WRITE FILEMARKS Command
  2164.  
  2165.                      Table 9-18: WRITE FILEMARKS Command
  2166.  
  2167. ==============================================================================
  2168.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2169. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2170. ==============================================================================
  2171.  0   |                           Operation Code (10h)                        |
  2172. -----|-----------------------------------------------------------------------|
  2173.  1   |   Logical Unit Number    |         ReserveΣ         |  WSmk  | Immed  |
  2174. -----|-----------------------------------------------------------------------|
  2175.  2   | (MSB)                                                                 |
  2176. -----|---                                                                 ---|
  2177.  3   |                           Transfe≥ LengtΦ                             |
  2178. -----|---                                                                 ---|
  2179.  4   |                                                                 (LSB) |
  2180. -----|-----------------------------------------------------------------------|
  2181.  5   ⁿ                           Control                                     |
  2182. ==============================================================================
  2183. .aw on
  2184. .pm 3
  2185.  
  2186.  
  2187. .cp 3
  2188. ááThσ WRIT┼ FILEMARK╙ commanΣ (Tablσ ╣-18⌐ request≤ tha⌠ thσ targe⌠ writσ thσ ì
  2189. specifieΣ numbe≥ oµ filemark≤ o≥ setmark≤ t∩ thσ curren⌠ positioε oε thσ ì
  2190. logica∞ unit.
  2191.  
  2192. .cp 3
  2193. ááIµ thσ Writσ Setmarδ (WSmk⌐ bi⌠ i≤ one¼ thσ transfe≥ lengtΦ specifie≤ thσ ì
  2194. numbe≥ oµ setmark≤ t∩ bσ written«  Iµ thσ WSmδ bi⌠ i≤ zero¼ thσ transfe≥ ì
  2195. lengtΦ specifie≤ thσ numbe≥ oµ filemark≤ t∩ bσ written.
  2196.  
  2197. .cp 5èááAε immediatσ (Immed⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ returε ì
  2198. statu≤ a≤ sooε a≤ thσ commanΣ descripto≥ blocδ ha≤ beeε validated«  Aε ImmeΣ ì
  2199. bi⌠ oµ onσ i≤ onl∙ valiΣ iµ buffereΣ modσ i≤ reporteΣ iε thσ modσ paramete≥ ì
  2200. heade≥ (9.3.3).
  2201.  
  2202. .cp 3
  2203. ááAε ImmeΣ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ returε statu≤ unti∞ ì
  2204. thσ writσ operatioε ha≤ completed«  An∙ buffereΣ data¼ filemarks¼ anΣ setmark≤ ì
  2205. shal∞ bσ writteε t∩ thσ mediuφ prio≥ t∩ completinτ thσ command.
  2206.  
  2207. .cp 4
  2208. .lm3
  2209. ááIMPLEMENTOR╙ NOTE║  Upoε completioε oµ an∙ buffereΣ writσ operation¼ thσ ì
  2210. ááinitiato≥ caε issuσ ß WRIT┼ FILEMARK╙ commanΣ witΦ thσ ImmeΣ bi⌠ se⌠ t∩ zer∩ ì
  2211. ááanΣ thσ transfe≥ lengtΦ fielΣ se⌠ t∩ zer∩ t∩ ensurσ tha⌠ al∞ buffereΣ data¼ ì
  2212. ááfilemarks¼ anΣ setmark≤ arσ successfull∙ writteε t∩ thσ medium.
  2213. .lm1
  2214.  
  2215. .cp 10
  2216. ááIµ thσ logica∞ uni⌠ encounter≤ earl∙-warninτ durinτ ß WRIT┼ FILEMARK╙ ì
  2217. command¼ aε attemp⌠ t∩ finisΦ writinτ an∙ buffereΣ data¼ filemarks¼ o≥ ì
  2218. setmark≤ ma∙ bσ made¼ a≤ determineΣ b∙ thσ curren⌠ setting≤ oµ thσ RE╫ anΣ SE╫ ì
  2219. bit≤ iε thσ devicσ configuratioε pagσ (9.3.3.1)«  Thσ commanΣ shal∞ terminatσ ì
  2220. witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ EO═ anΣ valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε ì
  2221. thσ sensσ data«  Iµ al∞ buffereΣ data¼ filemarks¼ anΣ setmark≤ arσ ì
  2222. successfull∙ transferreΣ t∩ thσ medium¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ N╧ SENS┼ ì
  2223. o≥ RECOVERE─ ERROR¼ a≤ appropriate« Iµ an∙ buffereΣ data¼ filemarks¼ o≥ ì
  2224. setmark≤ t∩ bσ writteε arσ no⌠ transferreΣ t∩ thσ mediuφ wheε earl∙-warninτ i≤ ì
  2225. encountered¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ VOLUM┼ OVERFLOW.
  2226.  
  2227. ááThσ informatioε fielΣ shal∞ bσ defineΣ a≤ follows:
  2228. .cp 3
  2229. áá(1⌐ Iµ unbuffereΣ modσ i≤ reporteΣ iε thσ modσ paramete≥ header¼ thσ ì
  2230. informatioε fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ ì
  2231. actua∞ numbe≥ oµ filemark≤ o≥ setmark≤ written.
  2232. .cp 7
  2233. áá(2⌐ Iµ buffereΣ modσ i≤ reporteΣ iε thσ modσ paramete≥ heade≥ anΣ thσ ì
  2234. buffereΣ datß wa≤ writteε iε variablσ blocδ modσ (seσ 9.2.14)¼ thσ informatioε ì
  2235. fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ numbe≥ oµ bytes¼ filemarks¼ anΣ setmark≤ no⌠ ì
  2236. writteε (thσ numbe≥ oµ filemark≤ o≥ setmark≤ no⌠ transferreΣ froφ thσ ì
  2237. initiato≥ plu≤ thσ numbe≥ oµ bytes¼ filemark≤ anΣ setmark≤ remaininτ iε thσ ì
  2238. target'≤ buffer)«  Notσ tha⌠ i⌠ i≤ possiblσ fo≥ thσ valuσ iε thσ informatioε ì
  2239. fielΣ t∩ exceeΣ thσ transfe≥ length.
  2240. .cp 6
  2241. áá(3⌐ Iµ buffereΣ modσ i≤ reporteΣ anΣ thσ buffereΣ datß wa≤ writteε iε fixeΣ ì
  2242. blocδ modσ (seσ 9.2.14)¼ thσ informatioε fielΣ shal∞ bσ se⌠ t∩ thσ tota∞ ì
  2243. numbe≥ oµ blocks¼ filemarks¼ anΣ setmark≤ no⌠ writteε (thσ numbe≥ filemark≤ o≥ ì
  2244. setmark≤ no⌠ transferreΣ froφ thσ initiato≥ plu≤ thσ numbe≥ oµ blocks¼ ì
  2245. filemarks¼ anΣ setmark≤ remaininτ iε thσ target'≤ buffer)«  Notσ tha⌠ i⌠ i≤ ì
  2246. possiblσ fo≥ thσ valuσ iε thσ informatioε fielΣ t∩ exceeΣ thσ transfe≥ length.
  2247.  
  2248. .cp 3
  2249. .lm 3
  2250. ááIMPLEMENTOR╙ NOTE║  Thσ targe⌠ shoulΣ ensurσ tha⌠ somσ additiona∞ datß caε ì
  2251. áábσ writteε t∩ thσ mediuφ (e.g.¼ labels¼ filemarks¼ o≥ setmarks⌐ afte≥ thσ ì
  2252. ááfirs⌠ earl∙-warninτ indicatioε ha≤ beeε returneΣ t∩ thσ initiator.
  2253. .lm 1
  2254.  
  2255. .cp 10èááIµ ß WRIT┼ FILEMARK╙ commanΣ i≤ receiveΣ whilσ thσ logica∞ uni⌠ i≤ ì
  2256. positioneΣ betweeε earl∙-warninτ anΣ enΣ-oµ-partition¼ thσ targe⌠ shal∞ returε ì
  2257. CHEC╦ CONDITIO╬ statu≤ afte≥ attemptinτ t∩ perforφ thσ command«  Thσ EO═ anΣ ì
  2258. valiΣ bit≤ shal∞ bσ se⌠ t∩ onσ iε thσ sensσ data«  Iµ al∞ filemark≤ o≥ ì
  2259. setmark≤ t∩ bσ writteε arσ successfull∙ transferreΣ t∩ thσ medium¼ thσ ì
  2260. informatioε fielΣ shal∞ bσ se⌠ t∩ zero«  Iµ an∙ filemark≤ o≥ setmark≤ t∩ bσ ì
  2261. writteε arσ no⌠ transferreΣ t∩ thσ mediuφ prio≥ t∩ encounterinτ enΣ-oµ-ì
  2262. partition¼ thσ sensσ ke∙ shal∞ bσ se⌠ t∩ VOLUM┼ OVERFLO╫ anΣ thσ informatioε ì
  2263. fielΣ shal∞ bσ se⌠ t∩ thσ requesteΣ transfe≥ lengtΦ minu≤ thσ actua∞ numbe≥ oµ ì
  2264. filemark≤ o≥ setmark≤ writteε t∩ thσ medium.
  2265.  
  2266.  
  2267. .cp 20
  2268. .aw off
  2269. .pm 0
  2270. 9.3. Parameter≤ fo≥ Sequential-Access Devices
  2271. .aw on
  2272. .pm 3
  2273.  
  2274. .cp 10
  2275. .aw off
  2276. .pm 0
  2277. 9.3.1. Diagnostic Paramete≥s
  2278. .aw on
  2279. .pm 3
  2280.  
  2281. ááThi≤ sectioε define≤ thσ descriptor≤ anΣ page≤ fo≥ diagnostiπ parameter≤ ì
  2282. useΣ witΦ sequentia∞-acces≤ devices« 
  2283.  
  2284. ááThσ diagnostiπ pagσ code≤ fo≥ sequentia∞-acces≤ device≤ arσ defineΣ iε Tablσ ì
  2285. ╣-19.
  2286.  
  2287. .aw off
  2288. .pm 0
  2289. .cp 15
  2290.                       Table 9-19: Diagnostiπ Page Codes
  2291.  
  2292. ==============================================================================
  2293. Page Code     Description                                           Section
  2294. ------------------------------------------------------------------------------
  2295. ááá00h        SupporteΣ Diagnostic Pagσ≤                            7.3.1.1
  2296. 01Φ ¡ 3Fh     ReserveΣ (fo≥ al∞ devicσ typσ page≤)                 
  2297. 40Φ ¡ 7Fh     Reserved
  2298. 80Φ ¡ FFh     Vendo≥-specifiπ pages
  2299. ==============================================================================
  2300. .aw on
  2301. .pm 3
  2302. .lm 1
  2303.  
  2304.  
  2305. .cp 25è.aw off
  2306. .pm 0
  2307. 9.3.2. Log Paramete≥s
  2308. .aw on
  2309. .pm 3
  2310.  
  2311. .cp 2
  2312. ááThi≤ sectioε define≤ thσ descriptor≤ anΣ page≤ fo≥ loτ parameter≤ useΣ witΦ ì
  2313. sequentia∞-acces≤ devices« 
  2314.  
  2315. .cp 20
  2316. ááThσ loτ pagσ code≤ fo≥ sequentia∞-acces≤ device≤ arσ defineΣ iε Tablσ ╣-20.
  2317.  
  2318. .aw off
  2319. .pm 0
  2320.                           Table 9-20: Loτ Page Codes
  2321.  
  2322. ==============================================================================
  2323.   Page Code    Descriptioε                                          Section
  2324. ------------------------------------------------------------------------------
  2325.      01h       Buffer Over-Run/Under-Run Page                       7.3.2.1
  2326.      02h       Erro≥ Counte≥ Pagσ (Write) Page                      7.3.2.2
  2327.      03h       Erro≥ Counte≥ Pagσ (Read) Page                       7.3.2.2
  2328.      04h       Erro≥ Counte≥ Pagσ (Read Reverse) Page               7.3.2.2
  2329.      05h       Erro≥ Counte≥ Pagσ (Verify⌐ Page                     7.3.2.2
  2330.      07h       Last n Error Events Page                             7.3.2.3
  2331.      06h       Non-Media Error Pagσ                                 7.3.2.4
  2332.      00h       Supported Loτ Pages                                  7.3.2.5
  2333.   08h - 2Fh    Reserved                              
  2334.      3Fh       Reserved                              
  2335.   30h - 3Eh    Vendo≥ Specific                       
  2336. ==============================================================================
  2337. .aw on
  2338. .pm 3
  2339.  
  2340.  
  2341. .cp 10
  2342. .aw off
  2343. .pm 0
  2344. 9.3.3. Mode Paramete≥s
  2345. .aw on
  2346. .pm 3
  2347.  
  2348. ááThi≤ sectioε define≤ thσ descriptor≤ anΣ page≤ fo≥ modσ parameter≤ useΣ witΦ ì
  2349. sequentia∞-acces≤ devices« 
  2350.  
  2351. ááThσ modσ paramete≥ list¼ includinτ thσ modσ paramete≥ heade≥ anΣ modσ blocδ ì
  2352. descriptor¼ arσ describeΣ iε 7.3.3.
  2353.  
  2354. ááThσ mediuφ-typσ codσ fielΣ iε thσ modσ paramete≥ heade≥ i≤ reserveΣ fo≥ ì
  2355. sequentia∞-acces≤ devices.
  2356.  
  2357. ááThσ devicσ-specifiπ paramete≥ bytσ oµ thσ modσ paramete≥ heade≥ (seσ Table≤ ì
  2358. ╖-6▒ anΣ ╖-62⌐ i≤ defineΣ iε Tablσ ╣-2▒ fo≥ sequentia∞-acces≤ devices.
  2359.  
  2360. .pm 0
  2361. .aw off
  2362.                       Table 9-21: Devicσ-Specifiπ Paramete≥ 
  2363.  
  2364. ==============================================================================
  2365.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2366. ==============================================================================
  2367.      ⁿ   W╨   ⁿ      BuffereΣ Modσ       ⁿ               SpeeΣ               |
  2368. ==============================================================================
  2369. .aw on
  2370. .pm 3
  2371.  
  2372.  
  2373. ááFo≥ thσ MOD┼ SENS┼ command¼ ß writσ protec⌠ (WP⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ ì
  2374. thσ mediuφ i≤ writσ enabled«  ┴ W╨ bi⌠ oµ onσ indicate≤ tha⌠ thσ mediuφ i≤ ì
  2375. writσ protected«  Fo≥ thσ MOD┼ SELEC╘ command¼ thi≤ fielΣ i≤ ignored.
  2376.  
  2377. .cp 17èááValue≤ fo≥ thσ buffereΣ modσ fielΣ arσ defineΣ a≤ follows:
  2378. .lm 12
  2379. áá0h       Thσ targe⌠ shal∞ no⌠ repor⌠ GOO─ statu≤ oε writσ command≤ unti∞ thσ ì
  2380. ááááááááááádatß block≤ arσ actuall∙ writteε oε thσ medium.
  2381.  
  2382. áá1h       Thσ targe⌠ ma∙ repor⌠ GOO─ statu≤ oε writσ command≤ a≤ sooε a≤ al∞ ì
  2383. áááááááááááthσ datß specifieΣ iε thσ writσ commanΣ ha≤ beeε transferreΣ t∩ thσ ì
  2384. ááááááááááátarget'≤ buffer«  Onσ o≥ morσ block≤ ma∙ bσ buffereΣ prio≥ t∩ ì
  2385. áááááááááááwritinτ thσ block(s⌐ t∩ thσ medium.
  2386.  
  2387. áá2h       Thσ targe⌠ ma∙ repor⌠ GOO─ statu≤ oε writσ command≤ a≤ sooε as:
  2388. áá         (1⌐ Al∞ thσ datß specifieΣ iε thσ writσ commanΣ ha≤ beeε     ì
  2389. ááááááááááásuccessfull∙ transferreΣ t∩ thσ target'≤ buffer¼ anΣ 
  2390. áá         (2⌐ Al∞ buffereΣ datß froφ differen⌠ initiator≤ ha≤ beeε ì
  2391. ááááááááááásuccessfull∙ writteε t∩ thσ medium« 
  2392.  
  2393. áá3h - 7h  Reserved
  2394. .lm 1
  2395.  
  2396. .cp 5
  2397. ááValue≤ fo≥ thσ speeΣ fielΣ shal∞ bσ assigneΣ a≤ follows:
  2398. áá0Φ       Defaul⌠ (Usσ thσ periphera∞ device'≤ defaul⌠ speed).
  2399. áá1Φ       Usσ thσ periphera∞ device'≤ lowes⌠ speed.
  2400. áá2Φ ¡ FΦ  Usσ increasinτ periphera∞ devicσ speeds.
  2401.  
  2402. .cp 6
  2403. ááFo≥ thσ MOD┼ SELEC╘ command¼ thσ densit∙ codσ fielΣ oµ thσ sequentia∞-acces≤ ì
  2404. devicσ blocδ descripto≥ (7.3.3⌐ indicate≤ thσ densit∙ selecteΣ b∙ thσ ì
  2405. initiato≥ fo≥ usσ iε subsequen⌠ reaΣ anΣ writσ operations«  Fo≥ device≤ ì
  2406. capablσ oµ automatiπ densit∙ recognition¼ thσ densit∙ codσ selecteΣ b∙ thσ ì
  2407. initiato≥ ma∙ bσ overriddeε b∙ thσ targe⌠ fo≥ ß subsequen⌠ reaΣ operatioε iµ ì
  2408. thσ selecteΣ valuσ doe≤ no⌠ matcΦ thσ curren⌠ recordeΣ densit∙ oµ thσ medium«  ì
  2409. Iµ thσ MOD┼ SELEC╘ commanΣ specifie≤ thσ defaul⌠ densit∙ codσ thσ devicσ ì
  2410. select≤ thσ actua∞ densit∙ codσ t∩ bσ useΣ iε ß vendo≥ specifiπ manner«  Thσ ì
  2411. valuσ i≤ expecteΣ t∩ bσ thσ principa∞ densit∙ codσ (o≥ aε optima∞ densit∙ ì
  2412. code).
  2413.  
  2414. .cp 4
  2415. ááFo≥ thσ MOD┼ SENS┼ command¼ thσ densit∙ codσ fielΣ reflect≤ thσ curren⌠ ì
  2416. operatinτ densit∙ oµ thσ device«  Iµ ß curren⌠ operatinτ densit∙ ha≤ no⌠ beeε ì
  2417. selected¼ eithe≥ becausσ n∩ mediuφ i≤ installeΣ o≥ becausσ thσ densit∙ oµ thσ ì
  2418. installeΣ mediuφ ha≤ no⌠ beeε determined¼ thσ densit∙ codσ fielΣ shoulΣ bσ se⌠ ì
  2419. t∩ thσ principa∞ densit∙ codσ value«  Thσ principa∞ densit∙ codσ i≤ thσ ì
  2420. highes⌠ densit∙ codσ supported¼ thσ optima∞ densit∙ codσ supported¼ o≥ thσ ì
  2421. mos⌠ commoε densit∙ codσ supported«  Iε somσ devices¼ thσ principa∞ densit∙ ì
  2422. codσ valuσ returneΣ iε responsσ t∩ ß MOD┼ SENS┼ commanΣ ma∙ changσ dynamicall∙ ì
  2423. t∩ matcΦ thσ mos⌠ recentl∙ selecteΣ density«  Thσ densit∙ codσ valuσ returneΣ ì
  2424. iε responsσ t∩ ß MOD┼ SENS┼ commanΣ shal∞ bσ a≤ describeΣ below:
  2425. .cp 2
  2426. áá(1⌐ Followinτ ß UNI╘ ATTENTIO╬ conditioε fo≥ ß powe≥ oε o≥ harΣ rese⌠ ì
  2427. condition¼ whilσ no⌠ ready¼ thσ targe⌠ shal∞ repor⌠ thσ principa∞ density.
  2428. .cp 2
  2429. áá(2⌐  Followinτ ß UNI╘ ATTENTIO╬ conditioε fo≥ ß no⌠-read∙-t∩-read∙ ì
  2430. transition¼ thσ targe⌠ shall:
  2431. .lm 3
  2432. .pm 6
  2433. .cp 2
  2434. ááááá(a⌐ repor⌠ thσ principa∞ densit∙ iµ n∩ attemp⌠ ha≤ beeε madσ b∙ thσ ì
  2435. áátarge⌠ t∩ determinσ thσ density.
  2436. .cp 2
  2437. ááááá(b⌐ repor⌠ thσ principa∞ densit∙ iµ thσ targe⌠ canno⌠ automaticall∙ ì
  2438. áádeterminσ thσ densit∙ froφ thσ medium.
  2439. .cp 2
  2440. ááááá(c⌐ repor⌠ thσ curren⌠ mediuφ densit∙ iµ thσ targe⌠ caε determinσ thσ ì
  2441. áádensit∙ froφ thσ medium.
  2442. .lm 1
  2443. .pm 3
  2444. .cp 6èáá(3⌐ Followinτ ß successfu∞ reaΣ operatioε a⌠ o≥ afte≥ beginninτ-oµ-medium¼ ì
  2445. thσ targe⌠ shal∞ repor⌠ ß densit∙ codσ valuσ reflectinτ thσ recordeΣ densit∙ ì
  2446. oµ thσ medium«  Fo≥ somσ implementations¼ thσ targe⌠ ma∙ automaticall∙ ì
  2447. determinσ thi≤ valuσ froφ thσ medium«  Fo≥ device≤ no⌠ capablσ oµ automatiπ ì
  2448. densit∙ determination¼ thσ principa∞ densit∙ i≤ reporteΣ iµ thσ densit∙ codσ ì
  2449. valuσ i≤ no⌠ provideΣ b∙ thσ precedinτ MOD┼ SELEC╘ command.
  2450. .cp 8
  2451. áá(4⌐ Followinτ aε unsuccessfu∞ reaΣ operatioε o≥ ß successfu∞ writσ ì
  2452. operation¼ whilσ a⌠ beginninτ-oµ-partition¼ thσ targe⌠ shall:
  2453. .lm 3
  2454. .pm 6
  2455. ááááá(a⌐ repor⌠ ß densit∙ codσ valuσ a≤ describeΣ fo≥ iteφ (2⌐ iµ ß previou≤ ì
  2456. ááMOD┼ SELEC╘ commanΣ ha≤ no⌠ establisheΣ ß densit∙ codσ fo≥ thσ currentl∙ ì
  2457. áámounteΣ volume.
  2458. ááááá(b⌐ repor⌠ ß densit∙ codσ valuσ a≤ provideΣ b∙ thσ las⌠ successfu∞ MOD┼ ì
  2459. ááSELEC╘ commanΣ fo≥ thσ currentl∙ mounteΣ volume.
  2460. .lm 1
  2461. .pm 3
  2462. .cp 3
  2463. áá(5⌐ Followinτ ß successfu∞ unloaΣ operatioε thσ targe⌠ shal∞ repor⌠ thσ mos⌠ ì
  2464. recen⌠ densit∙ codσ valuσ a≤ determineΣ b∙ item≤ (2⌐ througΦ (4⌐ above.
  2465.  
  2466. .cp 38
  2467. ááTablσ ╣-2▓ list≤ thσ sequentia∞-acces≤ devicσ densit∙ code≤ 
  2468.  
  2469. .aw off
  2470. .pm 0
  2471.                  Table 9-22: Sequentia∞-Acces≤ Densit∙ Codes
  2472.  
  2473. ==============================================================================
  2474. Codσ Valuσ                             Density
  2475. ----------  ------------------------------------------------------------------
  2476.    00Φ      Defaul⌠ densit∙ (MOD┼ SELEC╘ commanΣ only)
  2477.        
  2478.                                     Magnetic Tapes              
  2479.             WidtΦ                  Densit∙                          
  2480.             mφ  (Inch⌐   Track≤  bpmφ    bpΘ   Codσ  Typσ  Reference     Note
  2481.             ----------   ------  ------------  ----  ----  ------------  ----
  2482.    01Φ      12.╖ (0.5⌐      ╣     3▓    (800⌐  NRZ╔   ╥    X3.22-198│      2
  2483.    02h      12.7 (0.5)      9     63   (1600)  PE     R    X3.39-1986      2
  2484.    03h      12.7 (0.5)      9    246   (6250)  GCR    R    X3.54-1986      2
  2485.    04h       6.3 (0.25)    4/9   315   (8000)  GCR    C    X3.136-198╢    1,3
  2486.    05h       6.3 (0.25)    4/9   315   (8000)  GCR    C    X3.136-1986     1
  2487.    06h      12.7 (0.5)      9    126   (3200)  PE     R    X3.157-1987    2,4
  2488.    07h       6.3 (0.25)     4    252   (6400)  IMFM   C    X3.116-1986     1
  2489.    08h       3.81 (0.15)    4    315   (8000)  GCR    CS   X3.158-1987    1,4
  2490.    09h      12.7 (0.5)     18   1491  (37871)  GCR    C    X3B5/87-099    2,4
  2491.    0Ah      12.7 (0.5)     22    262   (6667)  MFM    C    X3B5/86-199    1,4
  2492.    0Bh       6.3 (0.25)     4     63   (1600)  PE     C    X3.56-1986      1
  2493.    0Ch      12.7 (0.5)     24    500  (12690)  GCR    C    HI-TC1         1,6
  2494.    0Dh      12.7 (0.5)     24    999  (25380)  GCR    C    HI-TC▓         1,6
  2495.    0Eh      Reserved for ECMA        
  2496.    0Fh       6.3 (0.25)    15    394  (10000)  GCR    ├    QIC-12░        1,6
  2497.    10Φ       6.│ (0.25⌐    1╕    39┤  (1░000⌐  GC╥    ├    QIC-15░        1,6
  2498.    11Φ       6.│ (0.25⌐    26    630  (16000⌐  GC╥    ├    QIC-32░        1,6
  2499.    12Φ       6.│ (0.25⌐    30   2034  (51667⌐  RL╠    ├    QIC-1350       1,6 
  2500.    13Φ       3.8▒ (0.15⌐    ▒   240░  (6▒000⌐  DDS    ├S   X3B5/88-185A    ╡ 
  2501.    14Φ       8.0░ (0.315⌐   ▒   212╢  (5┤000⌐         C╙   X3B5/88-03╢     5
  2502. 15h - 7Eh   Reserved
  2503.    7FΦ      N∩ changσ froφ previou≤ densit∙ (N╧-OP⌐                        7
  2504. 80h - FFh   Vendor unique
  2505. ==============================================================================
  2506. .pm 3
  2507.  
  2508. .cp 10èááKey:
  2509. áá               Codσ                                       Type
  2510. áá¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡       ¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡-
  2511. ááNRZ╔  Noε Returε t∩ Zero¼ changσ oε one≤           ╥   Ree∞-t∩-Reel
  2512. ááGC╥   Grou≡ Codσ Recordinτ                         ├   Cartridge
  2513. ááP┼    Phasσ EncodeΣ                                C╙  Cassette
  2514. ááIMF═  InverteΣ ModifieΣ Frequenc∙ Modulation
  2515. ááMF═   ModifieΣ Frequenc∙ Modulation
  2516. ááDD╙   DA╘ Datß Storage
  2517. ááRL╠   Ruε LengtΦ Limited
  2518. .cp 10
  2519. .aw on
  2520. ááNOTES:
  2521. áá(1⌐  Seria∞ Recorded.
  2522. áá(2⌐  Paralle∞ Recorded.
  2523. áá(3⌐  OlΣ forma⌠ knowε a≤ QI├-11.
  2524. áá(4⌐  Seσ Appendi° ─ fo≥ additiona∞ standard≤ information.
  2525. áá(5⌐  Helica∞ Scan
  2526. áá(6⌐  Thi≤ i≤ no⌠ aε Americaε Nationa∞ Standard«  Thσ referencσ i≤ baseΣ oε ì
  2527. aε industr∙ standarΣ definitioε oµ thσ mediß format.
  2528. áá(7⌐  Thi≤ densit∙ codσ valuσ i≤ defineΣ fo≥ thσ MOD┼ SELEC╘ commanΣ anΣ   ì
  2529. shal∞ no⌠ bσ returneΣ b∙ thσ MOD┼ SENS┼ command.
  2530.  
  2531.  
  2532. .cp 20
  2533. ááThσ modσ pagσ code≤ fo≥ sequentia∞-acces≤ device≤ arσ defineΣ iε Tablσ ╣-23.
  2534.  
  2535. .cp  25
  2536. .aw off
  2537. .pm 0
  2538.                          Table 9-23: Modσ Page Codes
  2539.  
  2540. ==============================================================================
  2541. Page Code     Description                                           Section
  2542. ------------------------------------------------------------------------------
  2543. ááá0Ah        Contro∞ Mode Page                                     7.3.3.1
  2544. ááá10h        Devicσ Configuratioε Pagσ                             9.3.3.1
  2545. ááá02h        Disconnect-Reconnect Page                             7.3.3.2
  2546. ááá11h        Mediuφ Partitioε Pagσ(1⌐                              9.3.3.2
  2547. ááá12h        Mediuφ Partitioε Page(2⌐                              9.3.3.3
  2548. ááá13h        Mediuφ Partitioε Pagσ(3⌐                              9.3.3.3
  2549. ááá14h        Mediuφ Partitioε Page(4⌐                              9.3.3.3
  2550. ááá09h        Peripheral Device Page                                7.3.3.3
  2551. ááá01h        ReaΣ-Writσ Erro≥ Recover∙ Pagσ                        9.3.3.4
  2552. ááá00h        Vendo≥ specific (does not require page format)        7.3.3
  2553. 03h - 08h     Reserved                                              
  2554. 0Bh - 10h     Reserved
  2555. 15h - 3Eh     Vendo≥ Specific (page format required)
  2556. ááá3Fh        Returns all page≤ (valiΣ onl∙ fo≥ thσ MOD┼ SENS┼ command)
  2557. ==============================================================================
  2558. .aw on
  2559. .pm 3
  2560. .lm 1
  2561.  
  2562.  
  2563. .cp 40è.aw off
  2564. .pm 0
  2565. 9.3.3.1. Devicσ Configuratioε Page
  2566.  
  2567.                     Table 9-24: Device Configuration Page
  2568.  
  2569. ==============================================================================
  2570.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2571. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2572. ==============================================================================
  2573.  0   ⁿ   P╙   |Reserved|         Page Code (10h)                             |
  2574. -----|-----------------------------------------------------------------------|
  2575.  1   |                           Page Length (0Eh)                           |
  2576. -----|-----------------------------------------------------------------------|
  2577.  2   |Reserved|  CAP   |  CAF   |                Active Format               |
  2578. -----|-----------------------------------------------------------------------|
  2579.  3   |                           Active Partition                            |
  2580. -----|-----------------------------------------------------------------------|
  2581.  4   |                           Write Buffer Full Ratio                     |
  2582. -----|-----------------------------------------------------------------------|
  2583.  ╡   ⁿ                           ReaΣ Buffe≥ Empt∙ Rati∩                     |
  2584. -----|-----------------------------------------------------------------------|
  2585.  6   | (MSB)                                                                 |
  2586. ¡¡¡¡-ⁿ¡¡¡                        Writσ Dela∙ Timσ                         ¡¡-|
  2587.  7   |                                                                 (LSB) |
  2588. -----|-----------------------------------------------------------------------|
  2589.  8   |  DBR   |  BIS   ⁿ  RSmδ  |  AVC   |      SOCF       |   RBO  |  REW   |
  2590. -----|-----------------------------------------------------------------------|
  2591.  9   |                           Gap Size                                    |
  2592. -----|-----------------------------------------------------------------------|
  2593.  10  |      EOD Defined         |  EEG   |  SEW   ⁿ        Reserved          |
  2594. -----|-----------------------------------------------------------------------|
  2595.  11  | (MSB)                                                                 |
  2596. -----|---                                                                 ---|
  2597.  1▓  ⁿ                           Buffe≥ Sizσ a⌠ Earl∙ Warninτ                |
  2598. -----|---                                                                 ---|
  2599.  13  |                                                                 (LSB) |
  2600. -----|-----------------------------------------------------------------------|
  2601.  14  |                           Select Data Compression Algorithm           |
  2602. -----|-----------------------------------------------------------------------|
  2603.  15  |                           Reserved                                    |
  2604. ==============================================================================
  2605. .aw on
  2606. .pm 3
  2607.  
  2608.  
  2609. ááThi≤ pagσ (Tablσ ╣-24⌐ i≤ useΣ t∩ specif∙ thσ appropriatσ sequentia∞-acces≤ ì
  2610. devicσ configuration.
  2611.  
  2612. .cp 3
  2613. áá┴ changσ activσ partitioε (CAP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ logica∞ ì
  2614. partitioε i≤ t∩ bσ changeΣ t∩ thσ onσ specifieΣ b∙ thσ activσ partitioε field« ì
  2615. ┴ CA╨ bi⌠ oµ zer∩ indicate≤ n∩ partitioε changσ i≤ specified.
  2616.  
  2617. .cp 4
  2618. áá┴ changσ activσ forma⌠ (CAF⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ activσ forma⌠ i≤ ì
  2619. t∩ bσ changeΣ t∩ thσ valuσ specifieΣ iε thσ activσ forma⌠ field«  ┴ CA╞ bi⌠ oµ ì
  2620. zer∩ indicate≤ n∩ activσ forma⌠ changσ i≤ specified«  Fo≥ somσ devices¼ thσ ì
  2621. forma⌠ ma∙ onl∙ bσ changeΣ wheε thσ logica∞ uni⌠ i≤ a⌠ beginninτ-oµ-partition.
  2622.  
  2623. .cp 5èáá Thσ activσ forma⌠ fielΣ indicate≤ whicΦ recordinτ forma⌠ i≤ iε usσ fo≥ thσ ì
  2624. selecteΣ densit∙ codσ wheε readinτ o≥ writinτ datß oε ß logica∞ unit«  Thσ ì
  2625. valuσ oµ thσ activσ forma⌠ fielΣ i≤ vendo≥ specific«  
  2626.  
  2627. .cp2
  2628. ááThσ activσ partitioε fielΣ indicate≤ thσ curren⌠ logica∞ partitioε numbe≥ iε ì
  2629. usσ oε thσ medium.
  2630.  
  2631. .cp 3
  2632. ááThσ writσ buffe≥ ful∞ ratio¼ oε WRIT┼ commands¼ indicate≤ t∩ thσ targe⌠ ho≈ ì
  2633. ful∞ thσ buffe≥ shal∞ bσ beforσ writinτ datß t∩ thσ medium«  ┴ valuσ oµ zer∩ ì
  2634. indicate≤ tha⌠ thσ valuσ i≤ no⌠ specified.
  2635.  
  2636. .cp3
  2637. ááThσ reaΣ buffe≥ empt∙ ratio¼ oε REA─ commands¼ indicate≤ t∩ thσ targe⌠ ho≈ ì
  2638. empt∙ thσ buffe≥ shal∞ bσ beforσ retrievinτ additiona∞ datß froφ thσ medium«  ì
  2639. ┴ valuσ oµ zer∩ indicate≤ tha⌠ thσ valuσ i≤ no⌠ specified.
  2640.  
  2641. .cp 6
  2642. ááThσ writσ dela∙ timσ indicate≤ thσ maximuφ time¼ iε 10░ milliseconΣ ì
  2643. increments¼ tha⌠ thσ targe⌠ shoulΣ wai⌠ beforσ an∙ buffereΣ datß tha⌠ i≤ t∩ bσ ì
  2644. written¼ i≤ forceΣ t∩ thσ mediuφ afte≥ thσ las⌠ buffereΣ WRIT┼ commanΣ tha⌠ ì
  2645. diΣ no⌠ causσ thσ buffe≥ t∩ exceeΣ thσ buffe≥ ful∞ ratio«  ┴ valuσ oµ zer∩ ì
  2646. indicate≤ tha⌠ thσ targe⌠ shal∞ neve≥ forcσ buffereΣ datß t∩ thσ mediuφ unde≥ ì
  2647. thesσ conditions.
  2648.  
  2649. .cp 4
  2650. áá┴ datß buffe≥ recover∙ (DBR⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ support≤ ì
  2651. datß buffe≥ recover∙ usinτ thσ RECOVE╥ BUFFERE─ DAT┴ command«  ┴ DB╥ bi⌠ oµ ì
  2652. zer∩ indicate≤ tha⌠ thσ targe⌠ doe≤ no⌠ suppor⌠ datß buffe≥ recovery«  Thi≤ ì
  2653. bi⌠ i≤ targe⌠-defined.
  2654.  
  2655. .cp 4
  2656. áá┴ blocδ identifier≤ supporteΣ (BIS⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ blocδ ID≤ arσ ì
  2657. no⌠ supporteΣ iε thσ forma⌠ writteε oε thσ medium«  ┴ BI╙ bi⌠ oµ onσ indicate≤ ì
  2658. tha⌠ thσ forma⌠ oε thσ mediuφ ha≤ recordeΣ informatioε abou⌠ thσ blocδ ID≤ ì
  2659. relativσ t∩ ß partition«  Thi≤ bi⌠ i≤ targe⌠-defined.
  2660.  
  2661. .cp 3
  2662. áá┴ repor⌠ setmark≤ (RSmk⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ ì
  2663. recognizσ anΣ repor⌠ setmark≤ durinτ appropriatσ reaΣ o≥ spacσ operations«  ┴ ì
  2664. RSmδ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ repor⌠ setmarks.
  2665.  
  2666. .cp 5
  2667. ááThσ automatiπ velocit∙ contro∞ (AVC⌐ bi⌠ oµ one¼ indicate≤ tha⌠ thσ devicσ ì
  2668. shal∞ selec⌠ thσ speeΣ (iµ thσ devicσ support≤ morσ thaε onσ speed⌐ baseΣ oε ì
  2669. thσ datß transfe≥ ratσ tha⌠ shoulΣ optimizσ streaminτ activit∙ anΣ minimizσ ì
  2670. mediuφ repositioning«  Aε AV├ bi⌠ oµ zer∩ indicate≤ thσ speeΣ choseε shoulΣ bσ ì
  2671. thσ device'≤ defaul⌠ speed.
  2672.  
  2673. .cp7
  2674. áá┴ sto≡ oε consecutivσ filemark≤ (SOCF⌐ fielΣ oµ 00Γ indicate≤ tha⌠ thσ ì
  2675. devicσ shal∞ prσ-reaΣ datß froφ thσ mediuφ iε buffereΣ modσ t∩ thσ limit≤ oµ ì
  2676. thσ buffe≥ capacit∙ withou⌠ regarΣ fo≥ filemarks«  Thi≤ implie≤ tha⌠ thσ ì
  2677. devicσ caε differentiatσ betweeε datß block≤ anΣ filemark≤ iε thσ buffer«  ì
  2678. Value≤ 01b¼ 10b¼ anΣ 11Γ specif∙ tha⌠ thσ devicσ shal∞ terminatσ thσ prσ-reaΣ ì
  2679. operatioε iµ 1¼ 2¼ o≥ │ consecutivσ filemark≤ arσ detected¼ respectively«  Iµ ì
  2680. thσ RSmδ bi⌠ i≤ one¼ thσ targe⌠ shal∞ interpre⌠ thi≤ fielΣ a≤ sto≡ oε ì
  2681. consecutivσ setmarks.
  2682.  
  2683. .cp 5èáá┴ recove≥ buffe≥ orde≥ (RBO⌐ bi⌠ oµ onσ indicate≤ tha⌠ datß block≤ shal∞ bσ ì
  2684. returneΣ froφ thσ target'≤ buffe≥ oε ß RECOVERE─ BUFFERE─ DAT┴ commanΣ iε LIF╧ ì
  2685. orde≥ (las⌠-iε-firs⌠-out⌐ froφ whicΦ the∙ werσ writteε t∩ thσ buffer«  ┴ RB╧ ì
  2686. bi⌠ oµ zer∩ indicate≤ datß block≤ shal∞ bσ returneΣ iε FIF╧ (firs⌠-iε-firs⌠-ì
  2687. out⌐ order.
  2688.  
  2689. .cp 4
  2690. áá┴ repor⌠ earl∙-warninτ (REW⌐ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ ì
  2691. repor⌠ thσ earl∙-warninτ conditioε fo≥ reaΣ operation≤ anΣ i⌠ shal∞ repor⌠ ì
  2692. earl∙-warninτ a⌠ o≥ beforσ an∙ mediuφ-defineΣ earl∙-warninτ positioε durinτ ì
  2693. writσ operations« 
  2694.  
  2695. .cp 5
  2696. áá┴ RE╫ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ returε CHEC╦ CONDITIO╬ ì
  2697. statu≤ witΦ thσ EO═ bi⌠ se⌠ iε thσ sensσ datß wheε thσ earl∙-warninτ positioε ì
  2698. i≤ encountereΣ durinτ reaΣ anΣ writσ operations«  Iµ thσ RE╫ bi⌠ i≤ onσ anΣ ì
  2699. thσ SE╫ bi⌠ i≤ zero¼ thσ targe⌠ shal∞ returε CHEC╦ CONDITIO╬ statu≤ witΦ thσ ì
  2700. sensσ ke∙ se⌠ t∩ VOLUM┼ OVERFLO╫ wheε earl∙-warninτ i≤ encountereΣ durinτ ì
  2701. writσ operations«  
  2702. áá 
  2703. .cp4
  2704. .lm 3
  2705. ááIMPLEMENTOR╙ NOTE║ ┴ RE╫ bi⌠ oµ onσ i≤ intendeΣ fo≥ compatibilit∙ witΦ thosσ ì
  2706. áásystem≤ usinτ olΣ tapσ format≤ tha⌠ requirσ aε earl∙-warninτ indicatioε ì
  2707. áádurinτ reaΣ operations«  Othe≥ system≤ shoulΣ se⌠ thi≤ bi⌠ t∩ zer∩ t∩ avoiΣ ì
  2708. áápotentia∞ datß los≤ wheε interchanginτ tape≤ betweeε periphera∞ devices.
  2709. .lm 1
  2710.  
  2711. .cp6
  2712. ááThσ GapSizσ fielΣ valuσ determine≤ thσ sizσ oµ thσ inte≥-blocδ ga≡ wheε ì
  2713. writinτ data«  ┴ valuσ oµ 00Φ specifie≤ thσ device'≤ defineΣ ga≡ size«  ┴ ì
  2714. valuσ oµ 01Φ specifie≤ ß devicσ defineΣ ga≡ sizσ sufficientl∙ lonτ t∩ suppor⌠ ì
  2715. updatσ-iε-place«  Value≤ oµ 02Φ througΦ 0FΦ arσ multiplier≤ oε thσ device'≤ ì
  2716. defineΣ ga≡ size«  Value≤ 10Φ througΦ 7FΦ arσ reserved«  Value≤ 80Φ througΦ ì
  2717. FFΦ arσ vendo≥ specific.
  2718.  
  2719. .cp 12
  2720. ááThσ enΣ-oµ-datß (EOD⌐ defineΣ fielΣ indicate≤ whicΦ forma⌠ typσ thσ logica∞ ì
  2721. uni⌠ shal∞ usσ t∩ detec⌠ anΣ generatσ thσ EO─ area«  Thσ type≤ oµ EO─ format≤ ì
  2722. arσ specifieΣ below:
  2723.  
  2724. .aw off
  2725. .pm 0
  2726.            Value                   Description
  2727.          --------¡   -----------------------------------------------
  2728.             000b     Logical unit's default EOD definitioε            
  2729.             001b     Format-defined erased area of mediuφ             
  2730.             010b     As specified in the SOCF field
  2731.             011b     EOD recognition and generation is not supporteΣ
  2732.          100Γ¡111Γ   ReserveΣ                                         
  2733. .aw on
  2734. .pm 3
  2735.  
  2736. .cp 3
  2737. ááAε enablσ EO─ generatioε (EEG⌐ bi⌠ se⌠ t∩ onσ indicate≤ tha⌠ thσ logica∞ ì
  2738. uni⌠ shal∞ generatσ thσ appropriatσ EO─ area¼ a≤ determineΣ b∙ thσ EO─ defineΣ ì
  2739. field« ┴ valuσ oµ zer∩ indicate≤ tha⌠ EO─ generatioε i≤ disabled.
  2740.  
  2741. .cp 5
  2742. .lm 3
  2743. ááIMPLEMENTOR╙ NOTE║  Somσ logica∞ unit≤ ma∙ no⌠ generatσ EO─ a⌠ thσ ì
  2744. áácompletioε oµ an∙ writσ-typσ operation.
  2745. .lm 1
  2746.  
  2747. .cp 7èááThσ synchronizσ a⌠ earl∙-warninτ (SEW⌐ bi⌠ se⌠ t∩ onσ indicate≤ tha⌠ thσ ì
  2748. targe⌠ shal∞ causσ an∙ buffereΣ writσ data¼ filemarks¼ o≥ setmark≤ t∩ bσ ì
  2749. transferreΣ t∩ thσ mediuφ wheε earl∙-warninτ i≤ encountered« ┴ valuσ oµ zer∩ ì
  2750. indicate≤ tha⌠ thσ targe⌠ shal∞ retaiε an∙ unwritteε buffereΣ data¼ filemarks¼ ì
  2751. o≥ setmark≤ iε thσ buffe≥ wheε earl∙-warninτ i≤ encountereΣ (seσ thσ WRIT┼ ì
  2752. command¼ 9.2.14¼ anΣ thσ WRIT┼ FILEMARK╙ command¼ 9.2.15).
  2753.  
  2754. .cp5
  2755. ááThσ buffe≥ sizσ a⌠ earl∙-warninτ fielΣ indicate≤ thσ value¼ iε bytes¼ t∩ ì
  2756. whicΦ thσ targe⌠ shal∞ reducσ it≤ logica∞ buffe≥ sizσ wheε writing«  Thσ ì
  2757. targe⌠ shoulΣ reducσ thσ buffe≥ sizσ onl∙ wheε thσ logica∞ uni⌠ i≤ positioneΣ ì
  2758. betweeε it≤ earl∙-warninτ anΣ enΣ-oµ-partition«  ┴ valuσ oµ zer∩ indicate≤ ì
  2759. tha⌠ thσ implementatioε oµ thi≤ functioε i≤ devicσ specific«  
  2760.  
  2761. .cp 2
  2762. .lm 3
  2763. ááNOTE║ Thσ inten⌠ i≤ t∩ preven⌠ thσ los≤ oµ datß b∙ limitinτ thσ sizσ oµ thσ ì
  2764. áábuffe≥ wheε nea≥ thσ enΣ-oµ-partition.
  2765. .lm 1
  2766.  
  2767. .cp5
  2768. ááThσ selec⌠ datß compressioε algorithφ fielΣ se⌠ t∩ 00Φ indicate≤ tha⌠ thσ ì
  2769. targe⌠ shal∞ no⌠ usσ ß compressioε algorithφ oε an∙ datß sen⌠ t∩ i⌠ prio≥ t∩ ì
  2770. writinτ thσ datß t∩ thσ medium«  ┴ valuσ oµ 01Φ indicate≤ tha⌠ thσ datß t∩ bσ ì
  2771. writteε shal∞ bσ compresseΣ usinτ thσ target'≤ defaul⌠ compressioε algorithm«  ì
  2772. Value≤ 02Φ througΦ 7FΦ arσ reserved«  Value≤ 80Φ througΦ FFΦ arσ vendo≥ ì
  2773. specific.
  2774.  
  2775. .cp 35è.aw off
  2776. .pm 0
  2777. 9.3.3.2. Mediuφ Partitioε Page(1)
  2778.  
  2779.                      Table 9-25: Medium Partition Page(1)
  2780.  
  2781. ==============================================================================
  2782.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2783. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2784. ==============================================================================
  2785.  0   ⁿ   P╙   |Reserved|         Page Code (11h)                             |
  2786. -----|-----------------------------------------------------------------------|
  2787.  1   |                           Page Length (n-1⌐                           |
  2788. -----|-----------------------------------------------------------------------|
  2789.  2   |                           Maximum Additional Partitions               |
  2790. -----|-----------------------------------------------------------------------|
  2791.  3   |                           Additional Partitions Defined               |
  2792. -----|-----------------------------------------------------------------------|
  2793.  4   |  FDP   |  SDP   |  IDP   |       PSUM      |       Reserved           |
  2794. -----|-----------------------------------------------------------------------|
  2795.  5   |                           Medium Format Recognition                   |
  2796. -----|-----------------------------------------------------------------------|
  2797.  6   |                           Reserved                                    |
  2798. -----|-----------------------------------------------------------------------|
  2799.  7   |                           Reserved                                    |
  2800. ==============================================================================
  2801. ╕ ¡ n|                   Partition Size Descriptor(s⌐                        |
  2802. ==============================================================================
  2803.  ░   | (MSB)                                                                 |
  2804. -----|---                        Partition Size                           ---|
  2805.  1   |                                                                 (LSB) |
  2806. ==============================================================================
  2807. .aw on
  2808. .pm 3
  2809.  
  2810.  
  2811. .cp 3
  2812. ááThi≤ pagσ (Tablσ ╣-25⌐ i≤ useΣ t∩ specif∙ thσ firs⌠ grou≡ oµ mediuφ ì
  2813. partitions«  Additiona∞ group≤ arσ specifieΣ iε mediuφ partitioε pages(▓-4).
  2814.  
  2815. .cp 3
  2816. ááThσ maximuφ additiona∞ partition≤ fielΣ i≤ ß targe⌠-defineΣ valuσ indicatinτ ì
  2817. thσ maximuφ numbe≥ oµ additiona∞ partition≤ supporteΣ b∙ thσ logica∞ unit«  ┴ ì
  2818. valuσ oµ zer∩ indicate≤ tha⌠ n∩ valuσ i≤ specified.
  2819.  
  2820. .cp 4 
  2821. ááThσ additiona∞ partition≤ defineΣ fielΣ specifie≤ thσ numbe≥ oµ additiona∞ ì
  2822. partition≤ t∩ bσ defineΣ fo≥ ß volumσ wheε thσ SD╨ o≥ ID╨ bi⌠ i≤ se⌠ t∩ one«  ì
  2823. Thσ maximuφ valuσ alloweΣ i≤ thσ valuσ returneΣ iε thσ maximuφ additiona∞ ì
  2824. partition≤ field.
  2825.  
  2826. .cp4
  2827. áá┴ fixeΣ datß partition≤ (FDP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ devicσ assign≤ ì
  2828. partition≤ baseΣ oε it≤ fixeΣ definitioε oµ partitions«  Settinτ thi≤ bi⌠ t∩ ì
  2829. onσ ma∙ onl∙ bσ valiΣ a⌠ beginninτ-oµ-partitioε anΣ i≤ mutuall∙ exclusivσ witΦ ì
  2830. thσ SD╨ anΣ ID╨ bits.
  2831.  
  2832. .cp5
  2833. áá┴ selec⌠ datß partition≤ (SDP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ devicσ i≤ t∩ ì
  2834. partitioε thσ mediuφ int∩ thσ thσ numbe≥ oµ partition≤ a≤ specifieΣ b∙ thσ ì
  2835. additiona∞ partition≤ defineΣ fielΣ usinτ partitioε size≤ defineΣ b∙ thσ ì
  2836. device«  Settinτ thi≤ bi⌠ t∩ onσ ma∙ onl∙ bσ valiΣ a⌠ beginninτ-oµ-partitioε ì
  2837. anΣ i⌠ i≤ mutuall∙ exclusivσ witΦ thσ FD╨ anΣ ID╨ fields.
  2838. è.cp 5
  2839. ááAε initiato≥-defineΣ partition≤ (IDP⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ ì
  2840. initiato≥ i≤ defininτ thσ numbe≥ anΣ sizσ oµ thσ datß partition≤ usinτ thσ ì
  2841. additiona∞ partition≤ defineΣ fielΣ anΣ thσ partitioε sizσ descriptors« ì
  2842. Settinτ thi≤ bi⌠ t∩ onσ ma∙ onl∙ bσ valiΣ a⌠ beginninτ-oµ-partitioε anΣ i≤ ì
  2843. mutuall∙ exclusivσ witΦ thσ FD╨ anΣ SD╨ fields.
  2844.  
  2845. .cp 3
  2846. .lm 3
  2847. ááIMPLEMENTOR╙ NOTE║ Sincσ defininτ partition≤ ma∙ requirσ rσ-formattinτ thσ ì
  2848. áámediuφ fo≥ somσ implementations¼ aε implici⌠ writσ t∩ thσ mediuφ ma∙ occu≥ ì
  2849. ááa≤ ß resul⌠ oµ ß MOD┼ SELEC╘ commanΣ tha⌠ supplie≤ an∙ oµ thesσ parameters.
  2850. .lm 1
  2851.  
  2852. .cp 4
  2853. ááPartitioε sizσ uni⌠ oµ measurσ (PSUM⌐ fielΣ define≤ thσ unit≤ iε whicΦ thσ ì
  2854. partitioε sizσ descriptor≤ selec⌠ thσ partitioε size«  Thσ value≤ 00b¼ 01b¼ ì
  2855. anΣ 10Γ definσ thσ unit≤ a≤ bytes¼ kilobytes¼ anΣ megabytes¼ respectively«  ì
  2856. Thσ valuσ 11Γ i≤ reserved.
  2857.  
  2858. .cp 3
  2859. áá Thσ mediuφ forma⌠ recognitioε fielΣ i≤ ß targe⌠-defineΣ valuσ indicatinτ ì
  2860. thσ device'≤ capabilit∙ t∩ automaticall∙ identif∙ thσ mediuφ forma⌠ anΣ ì
  2861. partitioε informatioε wheε readinτ aε unknowε volume.
  2862.  
  2863. .cp8
  2864. .pm 3
  2865. ááValue≤ fo≥ thσ mediuφ forma⌠ recognitioε fielΣ shal∞ bσ assigneΣ a≤ follows:
  2866.  
  2867. .pm 0
  2868.   00Φ    Logica∞ uni⌠ i≤ incapablσ oµ forma⌠ o≥ partitioε recognition.
  2869.   01Φ    Logica∞ uni⌠ i≤ capablσ oµ forma⌠ recognitioε only.
  2870.   02Φ    Logica∞ uni⌠ i≤ capablσ oµ partitioε recognitioε only.
  2871.   03Φ    Logica∞ uni⌠ i≤ capablσ oµ forma⌠ anΣ partitioε recognition.
  2872. 04Φ-FFΦ  Reserved.
  2873. .pm 3
  2874.  
  2875. .cp 4
  2876. .lm 3
  2877. ááIMPLEMENTOR╙ NOTE║ Iµ ß targe⌠ indicate≤ tha⌠ i⌠ i≤ no⌠ capablσ oµ mediuφ ì
  2878. ááforma⌠ recognition¼ thσ initiato≥ mus⌠ suppl∙ al∞ necessar∙ parameter≤ fo≥ ì
  2879. ááthσ devicσ t∩ identif∙ thσ specifiπ format«  Thσ valuσ iε thi≤ fielΣ ma∙ bσ ì
  2880. áádifferen⌠ followinτ ß mediuφ change.
  2881. .lm 1
  2882.  
  2883. .cp 5
  2884. ááPartitioε sizσ descriptor≤ definσ thσ sizσ oµ thσ respectivσ partition≤ iε ì
  2885. thσ unit≤ specifieΣ iε thσ PSU═ field«  U≡ t∩ 6┤ partition≤ ma∙ bσ defineΣ ì
  2886. usinτ thi≤ page«  Iµ additiona∞ partition≤ neeΣ t∩ bσ defined¼ u≡ t∩ 6┤ ì
  2887. partition≤ caε bσ defineΣ iε eacΦ oµ thσ mediuφ partitioε pages(▓-4⌐ defineΣ ì
  2888. iε 9.3.3.3.
  2889.  
  2890. .cp 20è.aw off
  2891. .pm 0
  2892. 9.3.3.3. Mediuφ Partitioε Page(2-4)
  2893.  
  2894.                     Table 9-26: Medium Partition Page(2-4)
  2895.  
  2896. ==============================================================================
  2897.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2898. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2899. ==============================================================================
  2900.  0   ⁿ   P╙   |Reserved|         Page Code (p)                               |
  2901. -----|-----------------------------------------------------------------------|
  2902.  1   |                           Page Length (n-1⌐                           |
  2903. ==============================================================================
  2904. 2 - n|                       Partition Size Descriptor(s⌐                    |
  2905. ==============================================================================
  2906.  ░   | (MSB)                                                                 |
  2907. -----|---                        Partition Size                           ---|
  2908.  ▒   |                                                                 (LSB) |
  2909. ==============================================================================
  2910. .aw on
  2911. .pm 3
  2912.  
  2913.  
  2914. .cp 2
  2915. ááThσ mediuφ partitioε page≤ (Tablσ ╣-26⌐ arσ useΣ t∩ specif∙ additiona∞ ì
  2916. group≤ oµ mediuφ partitions«  Thσ firs⌠ grou≡ i≤ specifieΣ iε thσ mediuφ ì
  2917. partitioε page(1⌐ (seσ 9.3.3.2).
  2918.  
  2919. .cp 5
  2920. ááThσ additiona∞ pagσ code≤ (p⌐ defineΣ fo≥ partitioε sizσ definitioε arσ 12h¼ ì
  2921. 13h¼ anΣ 14h«  U≡ t∩ ß maximuφ oµ 6┤ partition≤ caε bσ defineΣ iε eacΦ oµ ì
  2922. thesσ pages«  Thσ partitioε sizσ i≤ defineΣ b∙ thσ valuσ oµ thσ partitioε sizσ ì
  2923. field«  Thσ unit≤ oµ sizσ useΣ b∙ thσ partitioε sizσ fielΣ i≤ specifieΣ iε thσ ì
  2924. PSU═ fielΣ oµ thσ mediuφ partitioε page(1⌐ (9.3.3.2).
  2925.  
  2926. .cp 4
  2927. .lm 3
  2928. ááIMPLEMENTOR╙ NOTE║ Sincσ defininτ partition≤ ma∙ requirσ rσ-formattinτ thσ ì
  2929. áámediuφ fo≥ somσ implementations¼ aε implici⌠ writσ t∩ thσ mediuφ ma∙ occu≥ ì
  2930. ááa≤ ß resul⌠ oµ ß MOD┼ SELEC╘ commanΣ tha⌠ supplie≤ thesσ parameters« 
  2931. .lφ 1
  2932.  
  2933. .cp 35è.aw off
  2934. .pm 0
  2935. 9.3.3.4. Read-Writσ Erro≥ Recover∙ Page
  2936.  
  2937.                   Table 9-27: Read-Writσ Erro≥ Recover∙ Page
  2938.  
  2939. ==============================================================================
  2940.   Bit|   7    |   6    |   5    |   4    |   3    |   2    |   1    |   0    |
  2941. Bytσ ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        ⁿ        |
  2942. ==============================================================================
  2943.  0   ⁿ   P╙   |Reserved|         Page Code (01h)                             |
  2944. -----|-----------------------------------------------------------------------|
  2945.  1   |                           Page Length (0Ah)                           |
  2946. -----|-----------------------------------------------------------------------|
  2947.  2   |Reserved|Reserved|   TB   |Reserved|  EER   |  PER   |  DTE   |  DCR   |
  2948. -----|-----------------------------------------------------------------------|
  2949.  │   ⁿ                           ReaΣ Retr∙ Coun⌠                            |
  2950. -----|-----------------------------------------------------------------------|
  2951.  4   |                           Reserved                                    |
  2952. -----|-----------------------------------------------------------------------|
  2953.  5   |                           Reserved                                    |
  2954. -----|-----------------------------------------------------------------------|
  2955.  6   |                           Reserved                                    |
  2956. -----|-----------------------------------------------------------------------|
  2957.  7   |                           Reserved                                    |
  2958. -----|-----------------------------------------------------------------------|
  2959.  ╕   ⁿ                           Writσ Retr∙ Coun⌠                           |
  2960. -----|-----------------------------------------------------------------------|
  2961.  9   |                           ReserveΣ                                    |
  2962. -----|-----------------------------------------------------------------------|
  2963.  10  |                           Reserved                                    |
  2964. -----|-----------------------------------------------------------------------|
  2965.  11  |                           Reserved                                    |
  2966. ==============================================================================
  2967. .aw on
  2968. .pm 3
  2969.  
  2970.  
  2971. .cp 5
  2972. ááThσ reaΣ-writσ erro≥ recover∙ pagσ (Tablσ ╣-27⌐ specifie≤ thσ erro≥ recover∙ ì
  2973. anΣ reportinτ parameter≤ tha⌠ thσ targe⌠ shal∞ usσ wheε transferrinτ datß ì
  2974. betweeε thσ initiato≥ anΣ thσ medium«  Thesσ parameter≤ onl∙ appl∙ t∩ reaΣ-ì
  2975. writσ error≤ anΣ d∩ no⌠ affec⌠ messagσ systeφ retrie≤ o≥ positioninτ erro≥ ì
  2976. recover∙ procedures.
  2977.  
  2978. ááNOTE║ Thσ parameter≤ iε thi≤ pagσ als∩ appl∙ t∩ verif∙ operations.
  2979.  
  2980. .cp 6
  2981. áá┴ transfe≥ blocδ (TB⌐ bi⌠ oµ onσ indicate≤ tha⌠ ß datß blocδ tha⌠ i≤ no⌠ ì
  2982. recoverablσ withiε thσ specifieΣ recover∙ limit≤ shal∞ bσ transferreΣ t∩ thσ ì
  2983. initiato≥ beforσ CHEC╦ CONDITIO╬ statu≤ i≤ returned«  ┴ T┬ bi⌠ oµ zer∩ ì
  2984. indicate≤ tha⌠ thσ unrecoverablσ datß blocδ shal∞ no⌠ bσ transferreΣ t∩ thσ ì
  2985. initiator«  Datß block≤ tha⌠ caε bσ recovereΣ withiε thσ recover∙ limit≤ arσ ì
  2986. alway≤ transferred¼ regardles≤ oµ thσ valuσ oµ thσ T┬ bit.
  2987.  
  2988. .cp 6
  2989. ááAε enablσ earl∙ recover∙ (EER⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ ì
  2990. usσ thσ mos⌠ expedien⌠ erro≥ recover∙ algorithφ (e.g.¼ attemp⌠ erro≥ ì
  2991. correctioε prio≥ t∩ retries)«  Aε EE╥ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ ì
  2992. shal∞ usσ thσ mos⌠ deliberatσ erro≥ recover∙ algorithm¼ withiε thσ limit≤ ì
  2993. establisheΣ b∙ thσ othe≥ erro≥ recover∙ parameter≤ (e.g.¼ attemp⌠ t∩ recove≥ ì
  2994. thσ blocδ erro≥-freσ prio≥ t∩ usinτ erro≥ correction).è
  2995. .cp 5
  2996. áá┴ pos⌠ erro≥ (PER⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ returε CHEC╦ ì
  2997. CONDITIO╬ statu≤ t∩ repor⌠ recovereΣ errors«  ┴ PE╥ bi⌠ oµ zer∩ indicate≤ tha⌠ ì
  2998. thσ targe⌠ shal∞ no⌠ repor⌠ error≤ recovereΣ withiε thσ limit≤ establisheΣ b∙ ì
  2999. thσ erro≥ recover∙ parameters«  Iµ thi≤ bi⌠ i≤ zero¼ thσ DT┼ bi⌠ mus⌠ als∩ bσ ì
  3000. se⌠ t∩ zero.
  3001.  
  3002. .cp 6
  3003. áá┴ disablσ transfe≥ oε erro≥ (DTE⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ ì
  3004. terminatσ thσ datß transfe≥ afte≥ ß recovereΣ reaΣ-writσ erro≥ occurs«  Al∞ ì
  3005. datß froφ thσ recovereΣ blocδ shal∞ bσ transferreΣ prio≥ t∩ terminatinτ thσ ì
  3006. reaΣ-writσ operation«  ┴ DT┼ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ ì
  3007. terminatσ thσ transfe≥ fo≥ error≤ recovereΣ withiε thσ limit≤ establisheΣ b∙ ì
  3008. thσ reaΣ-writσ erro≥ recover∙ parameters.
  3009.  
  3010. .cp 3
  3011. áá┴ disablσ correctioε (DCR⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ targe⌠ shal∞ no⌠ ì
  3012. usσ erro≥ correctioε code≤ durinτ erro≥ recovery«  ┴ DC╥ bi⌠ oµ zer∩ allow≤ ì
  3013. thσ usσ oµ erro≥ correctioε code≤ fo≥ erro≥ recovery.
  3014.  
  3015. .cp 4
  3016. ááThσ reaΣ retr∙ coun⌠ specifie≤ thσ numbe≥ oµ time≤ tha⌠ thσ targe⌠ shoulΣ ì
  3017. attemp⌠ it≤ recover∙ algorithφ durinτ ß reaΣ operatioε beforσ aε unrecoverablσ ì
  3018. erro≥ i≤ reported«  ┴ reaΣ retr∙ coun⌠ oµ zer∩ indicate≤ tha⌠ thσ targe⌠ shal∞ ì
  3019. no⌠ usσ it≤ recover∙ algorithφ durinτ reaΣ operations.
  3020.  
  3021. .cp 4
  3022. ááThσ writσ retr∙ coun⌠ specifie≤ thσ numbe≥ oµ time≤ tha⌠ thσ targe⌠ shoulΣ ì
  3023. attemp⌠ it≤ recover∙ algorithφ durinτ ß writσ operatioε beforσ aε ì
  3024. unrecoverablσ erro≥ i≤ reported«  ┴ writσ retr∙ coun⌠ oµ zer∩ indicate≤ tha⌠ ì
  3025. thσ targe⌠ shal∞ no⌠ usσ it≤ recover∙ algorithφ durinτ writσ operations.
  3026.  
  3027. .cp 40è.aw off
  3028. .pm 0
  3029. 9.4. Glossar∙ fo≥ Sequentia∞ Acces≤ Devices
  3030. .aw on
  3031. .pm 1
  3032.  
  3033. beginninτ-oµ-partition.é Thσ positioε a⌠ thσ beginninτ oµ thσ permissiblσ ì
  3034. recordinτ regioε oµ ß partition«  Iµ onl∙ onσ partitioε i≤ defined¼ thi≤ ì
  3035. positioε i≤ typicall∙ equivalen⌠ t∩ thσ beginninτ-oµ-medium.
  3036.  
  3037. beginninτ-oµ-medium.é Thσ extremσ positioε alonτ thσ mediuφ iε thσ directioε ì
  3038. awa∙ froφ thσ suppl∙ ree∞ whicΦ caε bσ accesseΣ b∙ thσ device« 
  3039.  
  3040. buffereΣ mode.é ┴ modσ oµ datß transfe≥ iε writσ operation≤ whicΦ facilitate≤ ì
  3041. tapσ streaminτ (9.1.5)¼ a≤ reporteΣ iε thσ modσ paramete≥ heade≥ devicσ-ì
  3042. specifiπ paramete≥ (9.3.3).
  3043.  
  3044. earl∙-warning.é ┴ physica∞ marδ o≥ devicσ computeΣ positioε nea≥ bu⌠ logicall∙ ì
  3045. beforσ thσ enΣ-oµ-partitioε (independen⌠ oµ physica∞ direction)«  Seσ thσ RE╫ ì
  3046. bi⌠ iε thσ devicσ configuratioε pagσ iε 9.3.3.1.
  3047.  
  3048. enΣ-oµ-data.é EnΣ oµ datß iε ß partitioε i≤ denoteΣ iε forma⌠-specifiπ manner« ì
  3049. Seσ thσ EO─ defineΣ fielΣ iε thσ devicσ configuratioε pagσ iε 9.3.3.1.
  3050.  
  3051. enΣ-oµ-medium.é Thσ extremσ positioε alonτ thσ mediuφ iε thσ directioε awa∙ ì
  3052. froφ thσ takσ-u≡ ree∞ whicΦ caε bσ accesseΣ b∙ thσ device«  Thi≤ positioε ma∙ ì
  3053. bσ accesseΣ b∙ device≤ tha⌠ suppor⌠ thσ LOA─ UNLOA─ commanΣ witΦ thσ EO╘ bi⌠ ì
  3054. se⌠ t∩ one.
  3055.  
  3056. enΣ-oµ-partition.é Thσ positioε a⌠ thσ enΣ oµ thσ permissiblσ recordinτ regioε ì
  3057. oµ ß partition.
  3058.  
  3059. filemark.é ┴ specia∞ recordeΣ elemen⌠ withiε ß partition¼ containinτ n∩ use≥ ì
  3060. data¼ whicΦ provide≤ ß segmentatioε scheme.
  3061.  
  3062. overlength.é Thσ incorrec⌠ lengtΦ conditioε tha⌠ exist≤ afte≥ executinτ ß reaΣ ì
  3063. commanΣ wheε thσ thσ lengtΦ oµ thσ actua∞ blocδ reaΣ exceed≤ thσ requesteΣ ì
  3064. transfe≥ lengtΦ iε thσ commanΣ descripto≥ block.
  3065.  
  3066. partition.é Thσ entirσ usablσ regioε oµ recordinτ anΣ readinτ path≤ iε ß volumσ ì
  3067. o≥ iε ß portioε oµ ß volume¼ defineΣ iε ß devicσ-specifiπ manner«  Iµ therσ i≤ ì
  3068. morσ thaε onσ partition¼ the∙ shal∞ bσ numbereΣ startinτ witΦ zer∩ (i.e.¼ ì
  3069. beginninτ-oµ-partitioε-zero).
  3070.  
  3071. setmark.é  ┴ specia∞ recordeΣ elemen⌠ withiε ß partition¼ containinτ n∩ use≥ ì
  3072. data¼ whicΦ provide≤ ß segmentatioε schemσ hierarchicall∙ superio≥ t∩ ì
  3073. filemark≤ fo≥ usσ iε addressinτ o≥ fas⌠ positioninτ oε higΦ capacit∙ storagσ ì
  3074. devices.
  3075.  
  3076. spacing.é  Thσ ac⌠ oµ positioninτ thσ mediuφ oε ß sequentia∞ acces≤ device.
  3077.  
  3078. underlength.é Thσ incorrec⌠ lengtΦ conditioε tha⌠ exist≤ afte≥ executinτ ß reaΣ ì
  3079. commanΣ wheε thσ requesteΣ transfe≥ lengtΦ iε thσ commanΣ descripto≥ blocδ ì
  3080. exceed≤ thσ lengtΦ oµ thσ actua∞ blocδ read.
  3081.  
  3082. volume.é ┴ recordinτ mediuφ togethe≥ witΦ it≤ physica∞ carrier.
  3083. .lm 1
  3084. .pm 3
  3085. .aw on
  3086.  
  3087. ..end of section
  3088. .paè