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  |
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                            (C)opyright 1993



ST-31930N SCSI-2 Fast

  +===========+
  # REAR VIEW #  (ST-31930N only)
  +===========+

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



  +===========+
  # REAR VIEW #  (ST-31930NC only)
  +===========+
                     80 pin I/O and DC Power Wall/bracket Connection
                     |
    J1          /----|---------------\      TOP (HDA)
     ==========/ ×××××××××××××××××××× \==========
              (\-1------------------40/)    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
                                   2-557101-1 right angle to PCB

  +=================+
  # RIGHT SIDE VIEW #  (Both ST-31930N and ST-31930NC)
  +=================+


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-31930N 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-31930N and ST-31930NC)
  +============+


                      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+)
      If these ID jumper are used, then
         ID jumpers shown in left side view J5
         or 80 pin I/O cable ARE NOT USED.


                            ST-31930N


       UNFORMATTED CAPACITY (MB) ________________1900
       FORMATTED CAPACITY (xx SECTORS) (MB) _____1700
       AVERAGE SECTORS PER TRACK ________________
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________
       CYLINDERS ________________________________3898
       HEADS ______PHYSICAL______________________7
       DISCS (3.5 in) ___________________________4
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec)________38 to 62
       EXTERNAL TRANSFER RATE (mbytes/sec)_______10 Sync.
       SPINDLE SPEED (RPM) ______________________5411
       AVERAGE LATENCY (mSEC) ___________________5.54
       BUFFER ___________________________________512 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST
       TPI (TRACKS PER INCH) ____________________
       AVERAGE ACCESS (ms) (read/write)__________9.3/10.5
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) (read/write)_______1.2/1.7
       MAX FULL SEEK (ms) (read/write)___________19.4/20.4
       MTBF (power-on hours) ____________________800,000
       POWER REQUIREMENTS: +12V START-UP (amps) _1.7
                           +12V TYPICAL (amps) __0.36
                           +5V START-UP (amps) __
                           +5V TYPICAL (amps) ___0.54
                           TYPICAL (watts) ______7
                           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):     1.00/25.4
                        Width  (inches/mm):     4.02/102.1
                        Depth  (inches/mm):     5.77/146.6
                        Weight    (lbs/kg):     1.5/0.68

Already low-level formatted at the factory with 1 spare sector
per track and 2 spare cylinders/unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product
offerings or specifications. (08/08/94)