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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 1991
ST-1581N SCSI-2 Fast
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? REAR VIEW ?
?????????????
50 pin I/O Cable Connection
?????????????????????????1?
J4?:::::::::::::::::::::::::? /?????????\
????P?W?A????????????????????? 0 0 0 0 ???
???????1 ???????1 ???????1 ??5?G?G?12?
???????? ???????? ????????
?Terminating Resistors?
??????????????????
? LEFT SIDE VIEW ?
??????????????????
12345678
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FRONT J6?::::::::? BACK
OF ???????????1??????????????P?W?A?????????????????????????? OF
DRIVE ???????? DRIVE
Factory Use ???????? Terminator Power (see below)?
Motor Start ???????? Terminator Power (see below)????
Start Delay ???????? Reserved ?
Write Protect ???????? Parity ??????????????????????????????????
? Termination Power-source Table ?
???????????????????????????????????????????
? 7 8 7 8 7 8 ?
? ??? ??? ????? A Drive Supplies Own ?
? ???? ???? ????? B Drive Supplies Bus ?
? ???? ???? ? ? C Bus Supplies Drive ?
? A B C ?
?????????????P?W?A?????????????????????????
???????????????????
? RIGHT SIDE VIEW ?
???????????????????
?????
BACK J5?:::? FRONT
OF ?????????????P?W?A??????????????????????????????????????? OF
DRIVE ??? DRIVE
ID 4 ????? ID 1 If these ID jumpers are used,
ID 2 then ID jumpers shown in front
view ARE NOT USED.
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? FRONT VIEW ?
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If these ID jumper are used,
??????? then ID jumpers shown in right side
J7?:::::? view ARE NOT USED.
???1????????????P?W?A?????????????????????
?????
ID 1 ????? Remote LED
ID 2 ????? Spindle Synchronization
ID 4
ST - 1581N
UNFORMATTED CAPACITY (MB) ________________613
FORMATTED CAPACITY (xx SECTORS) (MB) _____525
AVERAGE SECTORS PER TRACK ________________77
ACTUATOR TYPE ____________________________VOICE COIL
TRACKS ___________________________________13,302
CYLINDERS ________________________________1,476
HEADS ____________________________________9
DISCS (3.5 in) ___________________________5
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec) _______20 to 32
SPINDLE SPEED (RPM) ______________________4,412
AVERAGE LATENCY (mSEC) ___________________6.8
BUFFER ___________________________________256 Kbyte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 Fast
SECTOR PER DRIVE _________________________1,022,868
TPI (TRACKS PER INCH) ____________________1760
BPI (BITS PER INCH) ______________________
AVERAGE ACCESS (ms) ______________________14
SINGLE TRACK SEEK (ms) ___________________2.5
MAX FULL SEEK (ms) _______________________26
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.5
+12V TYPICAL (amps) __0.54
+5V TYPICAL (amps) ___0.53/0.8(ND)
TYPICAL (watts) ______9/11.0(ND)
MAXIMUM (watts) ______15
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl)________________________AUTO PARK
IBM AT DRIVE TYPE ________________________0 or NONE
Already low-level formatted at the factory.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (4/12/91)