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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)
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? United States +1 408 438-8771 ? United Kingdom +44 628 478011 ?
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? Germany +49 89 140-9331 ? Singapore +65 227-2217 ?
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(C)opyright 1993
ST-12550N SCSI-2 Fast (Barracuda 2)
????????????? J01?????? 1?? ???????J4-1???????????????
? REAR VIEW ? (see 1?? ?"? ?
????????????? below) ??? ?"? ?
?"?J4 1-11 ?
Terminating Resistors?? ?"?(see detail below) ?
???????? ???????? ?"? ?
(TOP) ???????1 ???????1 ?"??J4-11? ?
???????????????????????????/?????????\ ? ?
??::::::::::::::::::::::::1?? 0 0 0 0 ?? ? ?
?????????????????????????????5?G?G?12? ? 5 1
50 pin I/O Cable Connection?? : : : : : : : : : : :
? ? ? ? ? ? ? ? 6 ? 2
SCSI ID = 0 (none) ? ? ? ? ? ? ? ? ? ? ?
SCSI ID = 4 ???????? ? ? ? ? ? ? ? ? ? ?
SCSI ID = 2 ?????????? ? ? ? ? ? ? ? ? ?
SCSI ID = 1 ???????????? ? ? ? ? ? ? ? ?
Reserved (default OFF) ????????? ? ? ? ? ? ? ?
Parity Disable ??????????????????? ? ? ? ? ? ?
Enable Motor Start ????????????????? ? ? ? ? ?
Delay Motor Start (10 sec * ID) ?????? ? ? ? ?
Write Protect Enable ??????????????????? ? ? ?
Remote LED Connector ????????????????????? ? ?
[pin-5 cathode (neg), pin-6 anode (pos)] ? ?
Reserved (default OFF) ????????????????????? ?
Spindle Synch Cable Connector ????????????????
(pin-1 SSREF, pin-2 ground)
??????????????????????????????????
? J01 - Terminator Power Jumpers ????????????????????
?????????????????????????????????? ?
Terminator power from the drive. ?1???
(default) ?????
? ?
Terminator power from pin 26 on the ???
SCSI bus. ????
????
Terminator to the SCSI bus on pin 26. ???
????
????
Terminator power to the SCSI bus and ?????
drive. ?????
?????
Note: ST-12550ND (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-12550N
UNFORMATTED CAPACITY (MB) ________________2572
FORMATTED CAPACITY (xx SECTORS) (MB) _____2139
AVERAGE SECTORS PER TRACK ________________81 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________51,433
CYLINDERS ________________________________2,707 user
HEADS ______PHYSICAL______________________19
DISCS (3.5 in) ___________________________10
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec)________34.3 to 56.5
EXTERNAL TRANSFER RATE (mbyte/sec) _______4 Async
EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync
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 ________________________4,177,781
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) _________13
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): 5.97/151.6
Weight (lbs/kg): 2.3/1.04
Already low-level formatted at the factory with 9 spare sectors
per cylinder and 1 spare cylinder per unit.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (08/08/94)