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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 ?
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? Germany +49 89 140-9331 ? Singapore +65 227-2217 ?
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(C)opyright 1994
ST-31250N SCSI-2 Fast (Barracuda 2LP)
?????????????
? REAR VIEW ? (ST-31250N/ND)
?????????????
50 pin I/O Cable Connection
?
?????????????????????????1? /?????????\ TOP (HDA)
??:::::::::::::::::::::::::??? 0 0 0 0 ???
??????????????????????????? ??5?G?G?12? BOTTOM
(o o) - These pins not on differential
??????? o o model ND
? o o
? 2 1
?
?? J1 Terminator options ??? (single-ended) ????????????
? o o (o o) o o o o ?o?o? ?
? o o o?o? ?o?o ?o?o? o o ?
? ?o?o? o?o? ?o?o ?o?o? o o ?
? 2???1 2 ??1 2?? 1 2???1 2 1 ?
? A B C D E ?
????????????????????????????????????????????????????????
A - Term. power from drive (default)
B - Term. power to SCSI bus (only option available for differential ND)
C - Term. power from SCSI bus
D - Term. power to SCSI bus and drive
E - Enable SCSI terminator (jumper on pins 5-6)
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? RIGHT SIDE VIEW ? (ST-31250N)
???????????????????
BACK ??? J2 123456789 TOP (HDA) FRONT
OF I/O???????????????????????P?W?A??????????????????????? OF
DRIVE ??? ::::::::: BOTTOM DRIVE
?????????
1-2 Reserved ????????????? Reserved 7-9
3 Parity Disable ????????????? Delay Motor Start 6
4 Write Protect ????????????? Motor Start Enable 5
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? FRONT VIEW ? (ST-31250N)
??????????????
J4
TOP (HDA) 1
??P?W?A??????????????????????::::::::::???
BOTTOM ??????????
??????????
Reserved ???????????? Reserved
ID 4 ???????????? Remote LED (pin-3 +5v)
ID 2 ???????????? Spindle Synchronization
ID 1 ???????? (pin-6 REF SIG+, default
jumper installed)
ST-31250N
Barracuda 2LP
UNFORMATTED CAPACITY (MB) ________________1205.3
FORMATTED CAPACITY (xx SECTORS) (MB) _____1020.9
AVERAGE SECTORS PER TRACK ________________107 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________18,555
CYLINDERS ________________________________3,711 user
HEADS ______PHYSICAL______________________5
DISCS (3.5 in) ___________________________3
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec)________47.5 to 72.0
EXTERNAL TRANSFER RATE (mbyte/sec) _______5 Async
EXTERNAL TRANSFER RATE (mbyte/sec) _______2.5 to 10 Sync
SPINDLE SPEED (RPM) ______________________7,200
AVERAGE LATENCY (mSEC) ___________________4.17
BUFFER ___________________________________512 KByte
Read Look-Ahead, Adaptive,
Multi-Segmented Cache
INTERFACE ________________________________SCSI-2 FAST
BYTES PER TRACK __________________________64,160 average
SECTORS PER DRIVE ________________________
TPI (TRACKS PER INCH) ____________________4,048
BPI (BITS PER INCH) ______________________73,820
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) ____________________800,000
SHOCK (G's):
operating (Read/Write) __________2
nonoperating ____________________50
ACOUSTICS (typ/max dBA) __________________4.7/
POWER REQUIREMENTS: +12V START-UP (amps) _1.26
+12V TYPICAL (amps) __0.88 idle
+5V START-UP (amps) __0.91
+5V TYPICAL (amps) ___0.33 idle
IDLE (watts) _________
LANDING ZONE (cyl) _______________________AUTO PARK
IBM AT DRIVE TYPE ________________________0 or NONE
Physical:
Height (inches/mm): 1.00/25.4
Width (inches/mm): 4.00/101.6
Depth (inches/mm): 5.75/146.05
Weight (lbs/g): 1.2/545
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. (08/25/94)