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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)
??????????????????????????????????????????????????????????????????????
? United States +1 408 438-8771 ? United Kingdom +44 628 478011 ?
??????????????????????????????????????????????????????????????????????
? Germany +49 89 140-9331 ? Singapore +65 227-2217 ?
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(C)opyright 1993
ST-1950N SCSI-2 Fast
?????????????
? REAR VIEW ?
?????????????
50 pin I/O Cable Connection
?
J1?????????????????????????1? /?????????\ TOP (HDA)
??:::::::::::::::::::::::::??? 0 0 0 0 ???
??????????????????????????? ??5?G?G?12? BOTTOM
1??????? 1??????? 1???????
???????? ???????? ????????
?Terminating Resistors?
???????????????????
? RIGHT SIDE VIEW ?
???????????????????
BACK ??? J2 12345678 TOP (HDA) FRONT
OF J1???????????????????????P?W?A??????????????????????? OF
DRIVE ??? :::::::: BOTTOM DRIVE
????????
?Terminator Power ???????? Reserved
??Terminator Power ???????? Start Delay (12 secs * ID)
? Factory Use ???????? Motor Start
? Parity Enable ???????? Write Protect
?
?
? ??????????????????????????????????
??? Termination Power-source Table ?
????????????????????????????????????????????????
??????....?????....?????PWA edge????? ?
? ?
? 1 2 1 2 1 2 ?
? ??? ??? A Drive Supplies Bus ?
? ???? ???? ????? B Drive Supplies Own ?
? ???? ???? ?? ?? C Bus Supplies Drive ?
? A B C ?
??????????Default???????????????????????????????
??????????????????
? LEFT SIDE VIEW ?
?????????????????? If these ID jumpers are used,
then ID jumpers shown in front
view ARE NOT USED.
FRONT TOP (HDA) J5 ???1? ???BACK
OF ????????P?W?A????????????????????????????????:::???J1 OF
DRIVE BOTTOM ????? ???DRIVE
???
Note: On early drives ? ID 1 ????? ID 4
with PCB# 75782395 or ? ID 2
#75782485 ID jumpers are??? ID 4 ID 1
reversed. ?
??????????????
? FRONT VIEW ?
??????????????
TOP (HDA) J6 ??????1?
??P?W?A???????????????????????????::::::??
* BOTTOM ????????
? 123456
LED ?? ??????
ID 4 ?????? Reserved
ID 2 ?????? Remote LED (pin-3 +5v)
ID 1 ?????? Spindle Synchronization
(pin-6 REF SIG+)
If these ID jumper are used, then
ID jumpers shown in left side
view ARE NOT USED.
ST - 1950N
UNFORMATTED CAPACITY (MB) ________________953
FORMATTED CAPACITY (xx SECTORS) (MB) _____803
AVERAGE SECTORS PER TRACK ________________76
ACTUATOR TYPE ____________________________VOICE COIL
TRACKS ___________________________________20,475
CYLINDERS ________________________________1,575 (user)
HEADS ____________________________________13
DISCS (3.5 in) ___________________________7
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec) _______25.2 to 41.2
EXTERNAL TRANSFER RATE (mbyte/sec) _______4 Async
EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync
SPINDLE SPEED (RPM) ______________________4,535
AVERAGE LATENCY (mSEC) ___________________6.61
BUFFER ___________________________________256 Kbyte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 Fast
BYTES PER TRACK __________________________46,550 avg.
TPI (TRACKS PER INCH) ____________________2,150
AVERAGE ACCESS (ms) (read/write)__________TBD
Drive level without controller overhead
SINGLE TRACK SEEK (ms) ___________________TBD
MAX FULL SEEK (ms) _______________________TBD
MTBF (power-on hours) ____________________200,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0
+12V TYPICAL (amps) __0.5
+5V TYPICAL (amps) ___0.4
TYPICAL (watts) ______11
IDLE (watts) _________9
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
Formatted at the factory with 1 spare sector per track
and two spare cylinders at inner tracks per unit.
Seagate reserves the right to change, without notice, product
offerings or specifications. (10/12/93)