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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-12450W SCSI-2 Fast Wide (Barracuda 2, 2HP)
2HP = 2 Head Parallel = two read write channels at once
J01??????
(see 1??
????????????? below) ???
? REAR VIEW ? 1?? ????????J4-1?????
????????????? ?"? |
?"?J4 1-6 ?
?"?(see b elow) |
?"??J4-6??? ?
(TOP) J5 ?"?-J4-7? | |
___________________ ??? ?1?/?????????\ | | |
?( ?????????????????1)??::::::?? 0 0 0 0 ?? ? ? ?
\?????????????????/ ? ?? ???5?G?G?12? ? ? 1
68 pin I/O Cable? ?????? : : : : : : :
Connection ?????? ? ? ? ? ? ? 2
?????? Reserved ??????? ? ? ? ? ? ?
Spindle Synch Cable Connector ???????? (some drives do ? ? ? ? ? ?
(pin-11 SSREF, pin-12 ground) ????? not have this ? ? ? ? ? ?
Remote LED Connector ????????????????? #7 jumper) ? ? ? ? ? ?
[pin-9 cathode (neg), ???? Enable Drive ????? ? ? ? ? ?
pin-10 anode (pos)] ???? Terminators ? ? ? ? ?
???? Reserved ??????????? ? ? ? ?
SCSI ID = 8 ?????????????????????????? (default OFF) ? ? ? ?
SCSI ID = 4 ?????????????????????????? Parity Disable ??????? ? ? ?
SCSI ID = 2 ?????????????????????????? Enable Motor Start ????? ? ?
SCSI ID = 1 ?????????????????????????? Delay Motor Start ???????? ?
SCSI ID = 0 (none) (10 sec * ID) ?
Write Protect Enable ???????
??????????????????????????????????
? 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. ?????
?????
* Valid for single ended drives only.
Note: ST-12450WD (differential model) does not come with any
provision to use Termination resistors. Therefore, SCSI bus
needs to be externally terminated.
ST-12450W
UNFORMATTED CAPACITY (MB) ________________2437
FORMATTED CAPACITY (xx SECTORS) (MB) _____1849
Standard OEM model formatted to 512
bytes/block
AVERAGE SECTORS PER TRACK ________________149 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________48,726
CYLINDERS ________________________________2,710 user
HEADS ______PHYSICAL/LOGICAL______________18/9
DISCS (3.5 in) ___________________________10
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec):
Per Logical Head _______________________68.6 to 113.0
Per Physical Head ______________________34.3 to 56.5
EXTERNAL TRANSFER RATE (mbyte/sec) _______20 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 WIDE
BYTES PER TRACK __________________________99,536 average
SECTORS PER DRIVE ________________________3,957,500
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
SHOCK (G's):
operating (Read/Write) __________2
nonoperating ____________________50
ACOUSTICS (typ/max dBA) __________________4.7/
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) _________13.5
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): 5.97/151.6
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. (08/26/94)