                         SEAGATE TECHNOLOGY, INC.
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Ŀ
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                            (C)opyright 1994



ST-12400W SCSI-2 Fast Wide (Hawk 2)

  ͻ
   REAR VIEW   (ST-12400W/WD only)
  ͼ
        (TOP)                J1-Auxiliary
          ___________________    1/\
        ( 1)ͳ:::::: 0 0 0 0 
          \ĳ/     25GG12
       68 pin I/O Cable        
                                
        Auxiliary option header     SCSI ID = 0 (none)
           pin-11 +5v  ٳ SCSI ID = 1
           pin-10 GND  ٳ SCSI ID = 2
           SCSI ID = 8  SCSI ID = 4
            or pin-8 BUSY        or pin-6 REFIND+


  ͻ
   REAR VIEW   (ST-12400WC only)
  ͼ
                     80 pin I/O and DC Power Wall/bracket Connection
                       Female
    J1          /ĳ\      TOP (HDA)
     /  \
              (\140/)    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 NC connector: AMP US p/n: 2-557103-1 straight-in, Male 80-pin
                                   2-557101-1 right angle to PCB

  ͻ
   RIGHT SIDE VIEW   (Both ST-12400W and ST-12400WC)
  ͼ


BACK   ͸       J2  12345678                    TOP (HDA)  FRONT
 OF    J1PWA OF
DRIVE  ;           ::::::::                    BOTTOM     DRIVE
                     
   Terminator Power ٳ Reserved
  ڴTerminator Power ٳ Start Delay (12 secs * ID)
       Enable T-Res ٳ Motor Start
      Parity Enable  Write Protect
  
  
   ST12400W onlyĿ
  Ĵ Termination Power-source Table 
    Ŀ
    ........PWA edge          
                                                  
      1 2     1 2      1 2                        
     ķ       ķ    ķ  A Drive Supplies Bus 
                B Drive Supplies Own 
                   C Bus Supplies Drive 
       A       B        C                         
    Default
  Note: The model ST-12400WC drive cannot furnish terminator power,
because no pins on the 80 pin I/O connector are devoted to terminator
power.


  ͻ
   FRONT VIEW   (ST-12400W only)
  ͼ

                      TOP (HDA)   J6  1
     PWA͵::::::
                 *    BOTTOM          2
                                      
            LED                      
                                       
               Auxiliary option header     SCSI ID = 0 (none)
                  pin-11 +5v  ٳ SCSI ID = 1
                  pin-10 GND  ٳ SCSI ID = 2
                  SCSI ID = 8  SCSI ID = 4
                   or pin-8 BUSY        or pin-6 REFIND+

      If these ID jumper are used, then
         ID jumpers shown in rear view Aux-J1
         or 80 pin I/O cable ARE NOT USED.

  ͻ
   FRONT VIEW   (ST-12400WC only)
  ͼ

                      TOP (HDA)   J6  1
     PWA͵::::::
                 *    BOTTOM          2
                                      
            LED                      
                                       
                  SCSI ID = 8 ٳ Remote LED (pin-2 cathode)
                  SCSI ID = 4 ٳ Sync Spindle
                  SCSI ID = 2 ٳ      SCSI ID = 0 (none)
                                           SCSI ID = 1


                            ST-12400W
                            Hawk 2

       UNFORMATTED CAPACITY (MB) ________________2537
       FORMATTED CAPACITY (xx SECTORS) (MB) _____2148
       AVERAGE SECTORS PER TRACK ________________84 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________49,799
       CYLINDERS ________________________________2,621 user
       HEADS ______PHYSICAL______________________19
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec)________26.8 to 45.6
       EXTERNAL TRANSFER RATE (mbyte/sec) _______20 Sync
       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
                                                 ASA
       SECTORS PER DRIVE ________________________
       TPI (TRACKS PER INCH) ____________________3000
       AVERAGE ACCESS (ms) (read/write)__________9.3/10.8
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) ___________________1
       MAX FULL SEEK (ms) _______________________21
       MTBF (power-on hours) ____________________500,000
       SHOCK (G's):
                operating (Read/Write) __________10
                nonoperating ____________________60
       ACOUSTICS (typ/max dBA) __________________
       POWER REQUIREMENTS: +12V START-UP (amps) _2.4
                           +12V TYPICAL (amps) __0.57
                           +5V START-UP (amps) __0.8
                           +5V TYPICAL (amps) ___0.42
                           TYPICAL (watts) ______8.9
                           MAXIMUM (watts) ______10.8
       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):     2.5/0.99

Already low-level formatted at the factory with twelve spare sectors
per cylinder 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. (08/26/94)
