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 1994



ST-31250N SCSI-2 Fast (Barracuda 2LP)

  +===========+
  # REAR VIEW #  (ST-31250N/ND)
  +===========+

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

                                     (o o) - These pins not on differential
                            /------   o o      model ND
                            |         o o
                            |        2   1
                            |
  /- J1 Terminator options -+- (single-ended) -----------\
  |      o o      (o o)      o o       o o      #o=o#    |
  |      o o       o#o#     #o#o      #o=o#      o o     |
  |     #o=o#      o|o|     |o|o      |o|o|      o o     |
  |     2===1     2 \=1     2=/ 1     2=#=1     2   1    |
  |      A         B         C         D         E       |
  \------------------------------------------------------/
     A - Term. power from drive (default)
     B - Term. power to SCSI bus (only option available for differential ND)
     C - Term. power from SCSI bus
     D - Term. power to SCSI bus and drive
     E - Enable SCSI terminator (jumper on pins 5-6)


  +=================+
  # RIGHT SIDE VIEW #  (ST-31250N)
  +=================+


BACK   #=#       J2  123456789                   TOP (HDA)  FRONT
 OF   I/O#======================P=W=A======================= OF
DRIVE  \=/           :::::::::                   BOTTOM     DRIVE
                     |||||||||
      1-2 Reserved --+/||||\++-- Reserved 7-9
  3 Parity Disable ----/||\----- Delay Motor Start 6
   4 Write Protect -----/\------ Motor Start Enable 5



  +============+
  # FRONT VIEW #  (ST-31250N)
  +============+

                                     J4
                      TOP (HDA)             1
     ==P=W=A=====================#::::::::::#==
                      BOTTOM      ||||||||||
                                  ||||||||||
                        Reserved -+++/|||||\- Reserved
                            ID 4 -----/|||\-- Remote LED (pin-3 +5v)
                            ID 2 ------/|\--- Spindle Synchronization
                            ID 1 -------/      (pin-6 REF SIG+, default
                                                 jumper installed)


                            ST-31250N
                            Barracuda 2LP

       UNFORMATTED CAPACITY (MB) ________________1205.3
       FORMATTED CAPACITY (xx SECTORS) (MB) _____1020.9
       AVERAGE SECTORS PER TRACK ________________107 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________18,555
       CYLINDERS ________________________________3,711 user
       HEADS ______PHYSICAL______________________5
       DISCS (3.5 in) ___________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec)________47.5 to 72.0
       EXTERNAL TRANSFER RATE (mbyte/sec) _______5 Async
       EXTERNAL TRANSFER RATE (mbyte/sec) _______2.5 to 10 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER ___________________________________512 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST
                                                 ASA II
       BYTES PER TRACK __________________________64,160 average
       SECTORS PER DRIVE ________________________
       TPI (TRACKS PER INCH) ____________________4,048
       BPI (BITS PER INCH) ______________________73,820
       AVERAGE ACCESS (ms) (read/write)__________8.0/9.0
         Drive level without controller overhead
       SINGLE TRACK SEEK (ms) ___________________0.6/0.9
       MAX FULL SEEK (ms) _______________________17/19
       MTBF (power-on hours) ____________________800,000
       SHOCK (G's):
                operating (Read/Write) __________2
                nonoperating ____________________50
       ACOUSTICS (typ/max dBA) __________________4.7/
       POWER REQUIREMENTS: +12V START-UP (amps) _1.26
                           +12V TYPICAL (amps) __0.88 idle
                           +5V START-UP (amps) __0.91
                           +5V TYPICAL (amps) ___0.33 idle
                           IDLE (watts) _________
       LANDING ZONE (cyl) _______________________AUTO PARK
       IBM AT DRIVE TYPE ________________________0 or NONE

       Physical:
                        Height (inches/mm):     1.00/25.4
                        Width  (inches/mm):     4.00/101.6
                        Depth  (inches/mm):     5.75/146.05
                        Weight     (lbs/g):     1.2/545

Already low-level formatted at the factory with 9 spare sectors
per cylinder and 1 spare cylinder per unit.

ZBR = Zone Bit Recording = Variable sectors per track

Seagate reserves the right to change, without notice, product
offerings or specifications. (08/25/94)