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USA BESTSELLER Vol 1-95 (Hepp-Computer)(1995).iso
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e177
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st31250w.txt
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1994-08-25
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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 │
└──────────────────────────────────┴─────────────────────────────────┘
(C)opyright 1994
ST-31250W/WC SCSI-2 Fast Wide (Barracuda 2LP)
╔═══════════╗
║ REAR VIEW ║ (ST-31250W only)
╚═══════════╝
┌───── ID 8
│┌──── ID 4
││┌─── ID 2
│││┌── ID 1
(TOP) J5 ││││
___________________ ┌── ─1┐/═════════\
═( ╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫1)═│::::::││ 0 0 0 0 ╞═
\────────────│────/ └ ── ┘└─5─G─G─12┘
68 pin I/O Cable┘ ││
Connection ││ (o o) - These pins not on
││ o o differential model WD
Spindle Synch Cable Connector ──┘│ o o
(pin-11 SSREF, pin-12 ground) │ 2 1
Remote LED Connector ────────────┘ │
[pin-9 cathode (neg), │
pin-10 anode (pos)] │
│
│
┌─ 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 WD)
C - Term. power from SCSI bus
D - Term. power to SCSI bus and drive
E - Enable SCSI terminator (jumper on pins 5-6)
╔═══════════╗
║ REAR VIEW ║ (ST-31250WC only)
╚═══════════╝
80 pin I/O and DC Power Wall/bracket Connection
│ Female
J1 /────│───────────────\ TOP (HDA)
══════════/ ╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫╫ \══════════
(\─1──────────────────40/) BOTTOM
Notes on 80 pin I/O connector:
pins 1 - 4 = +12v 41 - 44 = 12v GND
34 - 36 = +5v 74 - 76 = 5v GND
37 = SYNC 77 = LEDC
38 = MTRON 78 = DLYDST
39 = SCSIA0 79 = SCSIA1
40 = SCSIA2 80 = SCSIA3
Mating WC connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin
2-557101-1 right angle to PCB
╔═════════════════╗
║ RIGHT SIDE VIEW ║ (ST-31250W/WC)
╚═════════════════╝
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
╔════════════╗
║ FRONT VIEW ║ (ST-31250W/WC) ┌─────── +5V
╚════════════╝ │┌────── Enable SCSI terminator
││┌───── ID 8
│││┌──── ID 4
││││┌─── ID 2
│││││┌── ID 1 (J4 top row)
TOP (HDA) ││││││1
══P═W═A═════════════════════╡::::::::::╞══ J4
BOTTOM ││││││││││
││││││││││ (J4 bottom row)
Reserved ─┴┴┴┘││││││
No connection ─────┘│││││
Ground ──────┘││││
Unit Active LED pin (+) ───────┘│││
SSREF (+) spindle sync ────────┘││
Vendor Unique ─────────┘│
Fault LED pin (+) ──────────┘
ST-31250W
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) _______5.0 to 20 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 Wide
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)