                         SEAGATE TECHNOLOGY, INC.
       Customer Technical Support FAX Network +1 408 438-8137
     Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
Ŀ
 United States    +1 408 438-8771   United Kingdom +44 628 478011  
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                            (C)opyright 1991



ST-3283N
Rear View               50 pin SCSI Interface I/O connector
                       
                                           DC power
         (top)͸ /5GG12\
          ͵::::::::::::::::::::::::1͵ 0 0 0 0 
      (bottom); 
                 1 1 1
                   
                  Terminating Resistor Packs

ST-3283N
Left View
              (top)                       ͸
     Front....͵ I/O connector
                                o o o     ;
               SCSI ID Address  o o o
                                  
                          ID 1   
                          ID 2  
                          ID 4 

ST-3283N
Right View
           ͸           1o o o
    DC Power  oo o6
           ;  1o o                                 o o
                 oo4    Active/Passive Termination         o o
                                                 
     Terminator Power  Ŀ     Remote Start
                   Active: Pins 1 & 2 shorted         Parity Enable
                               only (+2.85V to        
                               110 ) for FAST        
                               SCSI; default          
                      Passive: Pins 2 & 4 shorted     
                               AND pins 5 & 6 shorted 
                               (+5V and GND to        
                               220/330 ) for         
                               standard SCSI.         
                      
                  
    Ŀ
    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 (default) ----------------- 3 & 4     
                     Terminating Resistors not Installed  Pins 2 & 4     
    

ST-3283N
Front View                     Clock Ground Ŀ      (Pin 3 removed for key)
                                                  
            (top)                       -o o o o o  o1
               +o o o o o o o 
            (bottom)                        
                                              
                         Remote LED      
                           Reserved     
           Ext. Spindle Clock Synch    
                           Reserved             
                           Reserved 
                           Reserved 
                           Reserved 


                             ST-3283N


       UNFORMATTED CAPACITY _____________________
       FORMATTED CAPACITY (xx SECTORS) __________248.62
       AVERAGE SECTORS PER TRACK ________________57 rounded down
       ACTUATOR TYPE ____________________________STRAIGHT ARM
       TRACKS ___________________________________8,455
       CYLINDERS ________________________________1,691 (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
       SPINDLE SPEED (RPM) ______________________4,500
       AVERAGE LATENCY (mSEC) ___________________6.67
       BUFFER ___________________________________128 Kbyte SeaCache
       INTERFACE ________________________________SCSI-2 Fast
       BYTES PER TRACK __________________________
       SECTORS PER DRIVE ________________________485,601
       TPI (TRACKS PER INCH) ____________________1,960
       BPI (BITS PER INCH) ______________________38,000
       AREAL DENSITY (MBits/sq in) ______________
       AVERAGE ACCESS (ms) ______________________12
       SINGLE TRACK SEEK (ms) ___________________<4
       MAX FULL SEEK (ms) _______________________35
       MTBF (power-on hours) Office _____________200,000
       POWER REQUIREMENTS: +12V START-UP (amps) _1.5
                           +5V TYPICAL (amps) ___0.55
       POWER MANAGEMENT (Watts):
                           ACTIVE _______________5.7
                           IDLE _________________3.5
                           STANDBY ______________1.0
                           SLEEP ________________
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO
       IBM AT DRIVE TYPE ________________________0

       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. (10/23/91)

