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ST3285N.TXT
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1994-02-11
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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)
⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¬ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
≥ United States +1 408 438-8771 ≥ United Kingdom +44 628 478011 ≥
√ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ≈ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¥
≥ Germany +49 89 140-9331 ≥ Singapore +65 227-2217 ≥
¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ¡ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
(C)opyright 1991
ST-3285N
Rear View ⁄ƒ 50 pin SCSI Interface I/O connector
≥
≥ DC power
(TOP) ’ÕÕÕÕÕÕÕÕÕÕÕÕ ÕÕÕÕÕÕÕÕÕÕÕ∏ /ƒ5ƒGƒGƒ12\
ÕÕÕÕµ::::::::::::::::::::::::1ΔÕµ 0 0 0 0 ΔÕ
(BOTTOM) ‘ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕæ ¿ƒƒƒƒƒƒƒƒƒŸ
⁄ƒƒƒƒƒ1 ⁄ƒƒƒƒƒ1 ⁄ƒƒƒƒƒ1
¿ƒƒƒƒƒŸ ¿ƒƒƒƒƒŸ ¿ƒƒƒƒƒŸ
Terminating Resistor Packs
ST-3285N
Left View o o o1
(TOP) o o o ’Õ∏
Front....ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÿÕÿÕÿÕÕÕÕÕµ I/O connector
≥ ≥ ≥ ‘Õæ
SCSI Address ID 1 ƒŸ ≥ ≥
ID 2 ƒƒƒŸ ≥
ID 4 ƒƒƒƒƒŸ
ST-3285N
Right View
o o4 o o o6 (TOP)
’Õ∏ 1o≥o 1o≥o o
DC Power ΔÕÕÕÕÿÕÕÕÕÕÕ ≥ ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
‘Õæ ≥ ≥
≥ ƒƒ¡ƒƒƒƒ
≥ Active/Passive Termination
ƒƒ¡ƒƒ ƒƒ¬ƒƒƒƒ
Terminator Power ⁄ƒƒƒ¡ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
ƒƒ¬ƒƒ ≥ Active: Pins 1 & 2 shorted ≥
≥ ≥ only (+2.85V to ≥
≥ ≥ 110 Í) for FAST ≥
≥ ≥ SCSI; ≥
≥ ≥Passive: Pins 2 & 4 shorted ≥
≥ ≥ AND pins 5 & 6 shorted ≥
≥ ≥ (+5V and GND to ≥
≥ ≥ 220/330 Í) for ≥
≥ ≥ standard SCSI. ≥
≥ ¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
≥
⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒ¡ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒø
≥Terminator Power: From SCSI Connector ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ Pins 1 & 2 ≥
≥ From Power Connector ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ Pins 1 & 3 ≥
≥ To SCSI Connector Only ƒƒƒƒƒƒƒƒƒƒƒƒƒ Pins 3 & 4 ≥
≥ From Power Connector and ƒƒƒƒƒƒƒƒƒƒƒ Pins 1 & 2 AND ≥
≥ to SCSI Bus --------------------------- 3 & 4 ≥
≥ Terminating Resistors not Installed ƒ Pins 2 & 4 ≥
¿ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒŸ
ST-3285N
Front View
⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒƒ SCSI ID's (none for ID0)
≥ not used if ID set on side jumpers
≥ ⁄ƒƒƒƒƒƒƒƒƒƒƒƒƒƒ Ext. Spindle Clock Synch
≥ ≥ pin-5 is Clock Ground
≥ ≥ ⁄ƒƒƒƒƒƒƒƒƒƒƒƒ Remote LED
(TOP) ⁄ƒ¡ƒø ≥ ≥ ⁄ƒƒƒƒƒƒ Reserved
4 2 1 ≥ ≥ ⁄ƒƒƒ¡ƒƒƒø
o o o o o-o o o o o
1o o o o o+o o o o o o o o o+
ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ1o o o o-ÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕÕ
≥ ≥ ≥ ≥
(BOTTOM) ≥ ≥ ≥ ¿ƒƒ Remote LED
≥ ≥ ¿ƒƒƒƒ Ext. Spindle Clock Synch
≥ ≥ pin-5 is Clock Ground
≥ ¿ƒƒƒƒƒƒ Remote Start Enable
¿ƒƒƒƒƒƒƒƒ Parity Enable
ST-3285N
UNFORMATTED CAPACITY _____________________
FORMATTED CAPACITY (xx SECTORS) __________248.62
AVERAGE SECTORS PER TRACK ________________57 rounded down
ACTUATOR TYPE ____________________________ROTARY VOICE COIL
TRACKS ___________________________________8,455
CYLINDERS ________________________________1,689 (user)
HEADS ____________________________________3
DISCS (3.5 in) ___________________________2
MEDIA TYPE _______________________________THIN FILM
HEAD TYPE ________________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (mbits/sec) _______15.0 to 24.4
SPINDLE SPEED (RPM) ______________________4,500
AVERAGE LATENCY (mSEC) ___________________6.67
BUFFER ___________________________________128 Kbyte SeaCache
Read Look-Ahead Multisegmented cache
INTERFACE ________________________________SCSI-2 Fast
SECTORS PER DRIVE ________________________485,601
TPI (TRACKS PER INCH) ____________________1,960
BPI (BITS PER INCH) ______________________38,000
AVERAGE ACCESS (ms) ______________________12
SINGLE TRACK SEEK (ms) ___________________<4
MAX FULL SEEK (ms) _______________________32
MTBF (power-on hours) Office _____________250,000
POWER REQUIREMENTS: +12V START-UP (amps) _1.5
POWER MANAGEMENT (Watts):
ACTIVE _______________5.7
IDLE _________________3.0
STANDBY ______________1.0
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl) _______________________AUTO
IBM AT DRIVE TYPE ________________________0
Formatted at the factory with 2 alternate cylinders. Total physical
cylinders equal 1691.
Physical:
Height (inches/mm): 1.00/25.4
Width (inches/mm): 4.02/102.1
Depth (inches/mm): 5.77/146.6
Weight (lbs/kg): 1.5/0.68
Note: If FAST SCSI transfer rates are used, then the active
termination options must be used. If the transfer rates are 5.0
MBytes/sec and below, either method of termination can be used.
Although active and passive terminated devices can be installed on the
same bus, both ends of the cable should be terminated in the same
manner, either both active or both passive.
Note: If your application requires no terminators, remove the
terminators from the circuit board. Merely removing the terminator
power source selection jumper does not disconnect the terminator
resistors from the circuit.
ZBR = Zone Bit Recording = Variable sectors per track
Seagate reserves the right to change, without notice, product
offerings or specifications. (09/29/93)