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ST11950W.TXT
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1994-02-11
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SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¬ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
≥ United States +1 408 438-8771 ≥ United Kingdom +44 628 478011 ≥
√ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ≈ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¥
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¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¡ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
(C)opyright 1993
ST-11950W SCSI-2 Fast Wide (Barracuda 1) (aka ST-11951N)
J01ƒƒƒƒƒø
…ÕÕÕÕÕÕÕÕÕÕÕª (see 1≥ø
∫ REAR VIEW ∫ below) ¿ƒŸ
»ÕÕÕÕÕÕÕÕÕÕÕº 1ƒø ƒƒƒƒƒƒƒJ4-1ƒƒƒƒø
≥"≥ |
≥"≥J4 1-6 ≥
≥"≥(see below) |
(TOP) J5 ¿"ŸƒJ4-6ƒø ≥
34________________1 ⁄ƒƒ ƒ1ø/ÕÕÕÕÕÕÕÕÕ\ | |
Õ( ◊◊◊◊◊◊◊◊◊◊◊◊◊◊◊◊◊ )Õ≥::::::≥≥ 0 0 0 0 ΔÕ ≥ ≥
\ƒƒƒƒƒƒƒƒƒƒƒƒ≥ƒƒƒƒ/ ¿ ƒƒ Ÿ¿ƒ5ƒGƒGƒ12Ÿ ≥ 1
68 pin I/O CableŸ ≥≥≥≥≥≥ : : : : : :
Connection ≥≥≥≥≥≥ ≥ ≥ ≥ ≥ ≥ 2
≥≥≥≥≥≥ ≥ ≥ ≥ ≥ ≥ ≥
Spindle Synch Cable Connector ƒƒŸ≥≥≥≥≥ Enable Drive ƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥
(pin-11 SSREF, pin-12 ground) ≥≥≥≥≥ Terminators * ≥ ≥ ≥ ≥ ≥
Remote LED Connector ƒƒƒƒƒƒƒƒƒƒƒƒŸ≥≥≥≥ Reserved ƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥
[pin-9 cathode (neg), ≥≥≥≥ (default OFF) ≥ ≥ ≥ ≥
pin-10 anode (pos)] ≥≥≥≥ Parity Disable ƒƒƒƒƒƒŸ ≥ ≥ ≥
≥≥≥≥ Enable Motor Start ƒƒƒƒŸ ≥ ≥
SCSI ID = 8 ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ≥≥≥ Delay Motor Start ƒƒƒƒƒƒƒŸ ≥
SCSI ID = 4 ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ≥≥ (10 sec * ID) ≥
SCSI ID = 2 ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ≥ Write Protect Enable ƒƒƒƒƒƒŸ
SCSI ID = 1 ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
SCSI ID = 0 (none)
Mating cable connector : AMP 786090-7, Male 68-pin
Drive connector : AMP 749721-7, Female 68-pin
⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
≥ J01 - Terminator Power Jumpers √ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥
Terminator power from the drive. ÷1ƒƒ∑ *
(default) ”¯ƒ¯Ω
¯ ¯
Terminator power from pin 26 on the ÷ƒ∑
SCSI bus. ¯∫¯∫
¯”¯Ω
Terminator to the SCSI bus on pin 26. ÷ƒ∑ *
∫¯∫¯
”¯Ω¯
Terminator power to the SCSI bus and ÷ƒ“ƒ∑*
drive. ∫¯∫¯∫
”¯Ω¯–
* Valid for single ended drives only.
Note: ST-11950WD (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-11950W
UNFORMATTED CAPACITY (MB) ________________2030
FORMATTED CAPACITY (xx SECTORS) (MB) _____1690
AVERAGE SECTORS PER TRACK ________________81 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________40,665
CYLINDERS ________________________________2,706 user
HEADS ______PHYSICAL______________________15
DISCS (3.5 in) ___________________________8
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
TRANSFER RATE INTERNAL (mbits/sec)________34.3 to 56.5
SPINDLE SPEED (RPM) ______________________7,200
AVERAGE LATENCY (mSEC) ___________________4.17
BUFFER __W/WD_____________________________1024/512 KByte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 FAST WIDE
BYTES PER TRACK __________________________50,888 average
SECTORS PER DRIVE ________________________3,291,790
TPI (TRACKS PER INCH) ____________________3,047
BPI (BITS PER INCH) ______________________52,187
AVERAGE ACCESS (ms) (read/write)__________8.0/9.0
Drive level without controller overhead
SINGLE TRACK SEEK (ms) ___________________0.6/0.9
MAX FULL SEEK (ms) _______________________17/19
MTBF (power-on hours) ____________________500,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.18
+12V TYPICAL (amps) __0.83 idle
+5V START-UP (amps) __1.0
+5V TYPICAL (amps) ___0.76 idle
IDLE (watts) _________12.5
LANDING ZONE (cyl) _______________________AUTO PARK
IBM AT DRIVE TYPE ________________________0 or NONE
Physical:
Height (inches/mm): 1.63/41.4
Width (inches/mm): 4.00/101.6
Depth (inches/mm): 5.97/146.1
Weight (lbs/kg): 1.8/0.80
Already low-level formatted at the factory with 6 spare sectors
per cylinder and 1 spare cylinders per unit.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (11/09/93)