                         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-12400N SCSI-2 Fast

  ͻ
   REAR VIEW 
  ͼ

         50 pin I/O Cable Connection
         
    J11 /\    TOP (HDA)
     ͵:::::::::::::::::::::::::ͳ 0 0 0 0 
      ; 5GG12    BOTTOM
       1Ŀ 1Ŀ 1Ŀ
         
        Terminating Resistors



  ͻ
   RIGHT SIDE VIEW 
  ͼ


BACK   ͸       J2  12345678                    TOP (HDA)  FRONT
 OF    J1PWA OF
DRIVE  ;           ::::::::                    BOTTOM     DRIVE
                     
   Terminator Power ٳ Reserved
  ڴTerminator Power ٳ Start Delay (16 secs * ID)
       Enable T-Res ٳ Motor Start                 
             Parity  Write Protect
  
  
   Ŀ
  Ĵ Termination Power-source Table 
    Ŀ
      1 2     1 2      1 2                        
     ķ       ķ           A Drive Supplies Bus 
                B Drive Supplies Own 
                 C Bus Supplies Drive 
       A       B        C                         
    ........PWA edge          
                                                  
    Default



  ͻ
   LEFT SIDE VIEW 
  ͼ             If these ID jumpers are used,
                                 then ID jumpers shown in front
                                 view ARE NOT USED.

  FRONT                TOP (HDA)                 J5 1 ͸BACK
   OF   PWA͵:::͵J1 OF
  DRIVE                BOTTOM                       ; ;DRIVE
                                                     
                                               ID 1 ٳ ID 4
                                                    ID 2   


  ͻ
   FRONT VIEW 
  ͼ


                      TOP (HDA)   J6  1
     PWA͵::::::
                 *    BOTTOM          ;
                                      123456
            LED                      
                                  ID 4 ٳ Reserved
                                  ID 2 ٳ Remote LED (pin-3 +5v)
                                  ID 1  Spindle Synchronization
                                               (pin-6 REF SIG+)
      If these ID jumper are used, then
         ID jumpers shown in left side
         view ARE NOT USED.


                            ST-12400N


       UNFORMATTED CAPACITY (MB) ________________2500
       FORMATTED CAPACITY (xx SECTORS) (MB) _____2100
       AVERAGE SECTORS PER TRACK ________________
       ACTUATOR TYPE ____________________________STRAIGHT ARM
       TRACKS ___________________________________49,894
       CYLINDERS __PHYSICAL/USER_________________2,626/
       HEADS ______PHYSICAL______________________19
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       TRANSFER RATE INTERNAL (mbits/sec)________25 to 41
       SPINDLE SPEED (RPM) ______________________5,411
       AVERAGE LATENCY (mSEC) ___________________5.54
       BUFFER ___________________________________256/1024 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST
       SECTORS PER DRIVE ________________________
       TPI (TRACKS PER INCH) ____________________
       AVERAGE ACCESS (ms) (read/write)__________9.0/10.5
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) ___________________2
       MAX FULL SEEK (ms) _______________________22
       MTBF (power-on hours) ____________________500,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.0
                           +12V TYPICAL (amps) __0.5
                           +5V START-UP (amps) __
                           +5V TYPICAL (amps) ___0.24
                           TYPICAL (watts) ______9
                           MAXIMUM (watts) ______
       WRITE PRECOMP (cyl) ______________________N/A
       REDUCED WRITE CURRENT (cyl) ______________N/A
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.63/41.4
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.75/146.1
                        Weight    (lbs/kg):     2.0/0.99

Already low-level formatted at the factory with one spare sector
per track and two spare cylinders/unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product
offerings or specifications. (01/21/93)
