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All Seagate SCSI 3_30_94
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ST11950N.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¥
≥ Germany +49 89 140-9331 ≥ Singapore +65 227-2217 ≥
¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¡ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
(C)opyright 1991
ST-11950N SCSI-2 Fast (Barracuda 1)
…ÕÕÕÕÕÕÕÕÕÕÕª J01ƒƒƒƒƒø 1ƒø ƒƒƒƒƒƒƒJ4-1ƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
∫ REAR VIEW ∫ (see 1≥ø ≥"≥ ≥
»ÕÕÕÕÕÕÕÕÕÕÕº below) ¿ƒŸ ≥"≥ ≥
≥"≥J4 1-11 ≥
Terminating Resistorsƒø ≥"≥(see detail below) ≥
⁄ƒƒƒƒƒƒø ⁄ƒƒƒƒ≥ƒø ≥"≥ ≥
(TOP) ¿ƒƒƒƒƒƒ1 ¿ƒƒƒƒƒƒ1 ¿"ŸƒJ4-11ø ≥
’ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ—/ÕÕÕÕÕÕÕÕÕ\ ≥ ≥
Õµ::::::::::::::::::::::::1Δ≥ 0 0 0 0 ΔÕ ≥ ≥
‘ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ≥ÕÕœ¿ƒ5ƒGƒGƒ12Ÿ ≥ 5 1
50 pin I/O Cable ConnectionƒŸ : : : : : : : : : : :
≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ 6 ≥ 2
SCSI ID = 0 (none) ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥
SCSI ID = 4 ƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥
SCSI ID = 2 ƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥
SCSI ID = 1 ƒƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥ ≥ ≥ ≥
Reserved (default OFF) ƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥ ≥ ≥
Parity Disable ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥ ≥
Enable Motor Start ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥ ≥ ≥
Delay Motor Start (10 sec * ID) ƒƒƒƒƒŸ ≥ ≥ ≥ ≥
Write Protect Enable ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥ ≥
Remote LED Connector ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥ ≥
[pin-5 cathode (neg), pin-6 anode (pos)] ≥ ≥
Reserved (default OFF) ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ ≥
Spindle Synch Cable Connector ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
(pin-1 SSREF, pin-2 ground)
⁄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¯–
Note: ST-11950ND (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-11950N
UNFORMATTED CAPACITY (MB) ________________2030
FORMATTED CAPACITY (xx SECTORS) (MB) _____1689
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 ___________________________________1024 KByte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 FAST
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 cylinder/unit.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (10/11/93)