SEAGATE TECHNOLOGY, INC.	        (C)opyright 1993

ST-12400N SCSI-2 Fast (Hawk 2)

  /-----------\
  | REAR VIEW |  (ST-12400N only)
  \-----------/

         50 pin I/O Cable Connection
         |
    J1/------------------------1\ /---------\    TOP (HDA)
     -|:::::::::::::::::::::::::|-| 0 0 0 0 |--
      \-------------------------/ \-5-G-G-12/    BOTTOM



  /-----------------\
  | RIGHT SIDE VIEW |  (Both ST-12400N and ST-12400NC)
  \-----------------/


BACK   /-\       J2  12345678                    TOP (HDA)  FRONT
 OF    J1|----------------------P-W-A----------------------- OF
DRIVE  \-/           ::::::::                    BOTTOM     DRIVE
                     ||||||||
   |Terminator Power /||||||\ Reserved
  /|Terminator Power -/||||\- Start Delay (12 secs * ID)
  |     Enable T-Res --/||\-- Motor Start
  |    Parity Enable ---/\--- Write Protect
  |
  |
  | /--------------------------------\
  \-| Termination Power-source Table |
    |----------------------------------------------\
    |-----....-----....-----PWA edge-----          |
    |                                              |
    |  1 2     1 2      1 2                        |
    | /-\       /-\    /---\  A Drive Supplies Bus |
    | |o|o     o|o|    \o-o/  B Drive Supplies Own |
    | \o/o     o\o/     o o   C Bus Supplies Drive |
    |   A       B        C                         |
    \---------Default------------------------------/


  /----------------\
  | LEFT SIDE VIEW |  (ST-12400N only)
  \----------------/             If these ID jumpers are used,
                                 then ID jumpers shown in front
                                 view ARE NOT USED.

  FRONT                TOP (HDA)                 J5 /--1\ /-\BACK
   OF   --------P-W-A-------------------------------|:::|-|J1 OF
  DRIVE                BOTTOM                       \---/ \-/DRIVE
                                                     |||
                                               ID 1 -/|\- ID 4
                                                    ID 2


  /------------\
  | FRONT VIEW |  (Both ST-12400N and ST-12400NC)
  \------------/


                      TOP (HDA)   J6  /-----1\
     --P-W-A--------------------------|::::::|-
                 *    BOTTOM          \------/
                 |                     123456
            LED -/                     ||||||
                                  ID 4 /||||\ Reserved
                                  ID 2 -/||\- Remote LED (pin-3 +5v)
                                  ID 1 --/\-- Spindle Synchronization
                                               (pin-6 REF SIG+, default
      If these ID jumper are used, then          jumper installed)
         ID jumpers shown in left side view J5
         or 80 pin I/O cable ARE NOT USED.


                            ST-12400N
                            Hawk 2

       UNFORMATTED CAPACITY (MB) ________________2537
       FORMATTED CAPACITY (xx SECTORS) (MB) _____2148
       AVERAGE SECTORS PER TRACK ________________83 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) _______5 Async
       EXTERNAL TRANSFER RATE (mbyte/sec) _______10 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)__________9.0/10.5
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) ___________________1
       MAX FULL SEEK (ms) _______________________19
       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) _2.0
                           +12V TYPICAL (amps) __0.54
                           +5V START-UP (amps) __0.8
                           +5V TYPICAL (amps) ___0.43
                           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):     2.5/0.99

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. (08/09/94)