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 1991 ST-3283N Rear View /- 50 pin SCSI Interface I/O connector | | DC power (TOP) #============ ===========# /-5-G-G-12\ ====#::::::::::::::::::::::::1#=# 0 0 0 0 #= (BOTTOM) \=========================/ \---------/ /-----1 /-----1 /-----1 \-----/ \-----/ \-----/ Terminating Resistor Packs ST-3283N Left View o o o1 (TOP) o o o #=# Front....==================#=#=#=====# I/O connector | | | \=/ SCSI Address ID 1 -/ | | ID 2 ---/ | ID 4 -----/ ST-3283N Right View (board part number 260035, early version) o o4 (TOP) o o4 #=# 1o|o o o o6 1o o DC Power #====#======1o|o o ============================#=#= \=/ | --+---- | | | Active/Passive Termination | \ Remote Start --+-- --+---- \-- Parity Enable Terminator Power /---+----------------------------\ --+-- | Active: Pins 1 & 2 shorted | | | only (+2.85V to | | | 110 ê) for FAST | | | SCSI; | | |Passive: Pins 2 & 4 shorted | | | AND pins 5 & 6 shorted | | | (+5V and GND to | | | 220/330 ê) for | | | standard SCSI. | | \--------------------------------/ | /-------------+--------------------------------------------------------\ |Terminator Power: From SCSI Connector ---------------- Pins 1 & 2 | | From Power Connector --------------- Pins 1 & 3 | | To SCSI Connector Only ------------- Pins 3 & 4 | | From Power Connector and ----------- Pins 1 & 2 AND | | to SCSI Bus --------------------------- 3 & 4 | | Terminating Resistors not Installed - Pins 2 & 4 | \----------------------------------------------------------------------/ ST-3283N Right View o o4 o o o6 (TOP) #=# 1o|o 1o|o o DC Power #====#====== | ================================ \=/ | | | --+---- | Active/Passive Termination --+-- --+---- Terminator Power /---+----------------------------\ --+-- | Active: Pins 1 & 2 shorted | | | only (+2.85V to | | | 110 ê) for FAST | | | SCSI. | | |Passive: Pins 2 & 4 shorted | | | AND pins 5 & 6 shorted | | | (+5V and GND to | | | 220/330 ê) for | | | standard SCSI; default.| | \--------------------------------/ | /-------------+--------------------------------------------------------\ |Terminator Power: From SCSI Connector ---------------- Pins 1 & 2 | | From Power Connector (default) ----- Pins 1 & 3 | | To SCSI Connector Only ------------- Pins 3 & 4 | | From Power Connector and ----------- Pins 1 & 2 AND | | to SCSI Bus --------------------------- 3 & 4 | | Terminating Resistors not Installed - Pins 2 & 4 | \----------------------------------------------------------------------/ ST-3283N Front View (board part number 260035, early version) (TOP) o o o o o o o+ ==== o = o o o o o-========================== (BOTTOM) 1\---+-/ | | | | | | \-- Remote LED | | \---- Reserved | \------ Ext. Spindle Clock Synch | pin-9 is Clock Ground | / Reserved \---------| Reserved | Reserved pin-3 removed for key \ Reserved ST-3283N Front View /------------------ SCSI ID's (none for ID0) | not used if ID set on side jumpers | /-------------- Ext. Spindle Clock Synch | | pin-5 is Clock Ground | | /------------ Remote LED (TOP) /-+-\ | | /------ Reserved 4 2 1 | | /---+---\ o o o o o-o o o o o 1o o o o o+o o o o o o o o o+ ====================1o o o o-================ | | | | (BOTTOM) | | | \-- Remote LED | | \---- Ext. Spindle Clock Synch | | pin-5 is Clock Ground | \------ Remote Start Enable \-------- Parity Enable ST-3283N 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 ____________________________________5 DISCS (3.5 in) ___________________________3 MEDIA TYPE _______________________________THIN FILM HEAD TYPE ________________________________THIN FILM RECORDING METHOD _________________________ZBR RLL (1,7) INTERNAL TRANSFER RATE (mbits/sec) _______15.0 to 24.4 EXTERNAL TRANSFER RATE (mbyte/sec) _______4 Async EXTERNAL TRANSFER RATE (mbyte/sec) _______10 Sync 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. (08/08/94)