SEAGATE TECHNOLOGY, INC.
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                            (C)opyright 1993



ST-12450W SCSI-2 Fast Wide (Barracuda 2, 2HP)
2HP = 2 Head Parallel = two read write channels at once

                                        J01-----\
                                       (see    1|\
+===========+                           below) \-/
# REAR VIEW #                                  1-\ --------J4-1----\
+===========+                                  |"|                 #
                                               |"|J4 1-6           |
                                               |"|(see below)      #
                                               +"|-J4-6--\         |
        (TOP)                    J5            \"/-J4-8\ #         #
          ___________________  /--  -1\/=========\     # #         #
        =( ×××××××××××××××××1)=|::::::|| 0 0 0 0 #=    | |         |
          \------------|----/  \  --  /\-5-G-G-12/     | |         1
       68 pin I/O Cable/        ||||||                 : : : : : : :
       Connection               ||||||                 | | | | | | 2
                                ||||||  Reserved ------/ | | | | | |
Spindle Synch Cable Connector --/|||||   (J4-7 and J4-8  | | | | | |
  (pin-11 SSREF, pin-12 ground)  |||||    are reserved)  | | | | | |
Remote LED Connector ------------/||||                   | | | | | |
 [pin-9 cathode (neg),            ||||  Enable Drive ----/ | | | | |
  pin-10 anode (pos)]             ||||   Terminators       | | | | |
                                  ||||  Reserved ----------/ | | | |
SCSI ID = 8 ----------------------/|||   (default OFF)       | | | |
SCSI ID = 4 -----------------------/||  Parity Disable ------/ | | |
SCSI ID = 2 ------------------------/|  Enable Motor Start ----/ | |
SCSI ID = 1 -------------------------/  Delay Motor Start -------/ |
SCSI ID = 0 (none)                       (10 sec * ID)             |
                                        Write Protect Enable ------/
/--------------------------------\
| J01 - Terminator Power Jumpers +------------------\
\--------------------------------/                  |
            Terminator power from the drive.       #1--# *
              (default)                            #o-o#
                                                    o o
            Terminator power from pin 26 on the      #-# *
              SCSI bus.                             o#o#
                                                    o#o#

            Terminator to the SCSI bus on pin 26.   #-#  
                                                    #o#o
                                                    #o#o

            Terminator power to the SCSI bus and    #-Ò-#*
              drive.                                #o#o#
                                                    #o#o+
            * Valid for single-ended drives only.


    Note: ST-12450WD (differential model) does not come with any
          provision to use Termination resistors.  Therefore, SCSI bus
          needs to be externally terminated.


                            ST-12450W


       UNFORMATTED CAPACITY (MB) ________________2437
       FORMATTED CAPACITY (xx SECTORS) (MB) _____1849
           Standard OEM model formatted to 512
           bytes/block
       AVERAGE SECTORS PER TRACK ________________149 rounded down
       ACTUATOR TYPE ____________________________ROTARY VOICE COIL
       TRACKS ___________________________________48,726
       CYLINDERS ________________________________2,710 user
       HEADS ______PHYSICAL/LOGICAL______________18/9
       DISCS (3.5 in) ___________________________10
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________ZBR RLL (1,7)
       INTERNAL TRANSFER RATE (mbits/sec):
         Per Logical Head _______________________68.6 to 113.0
         Per Physical Head ______________________34.3 to 56.5
       EXTERNAL TRANSFER RATE (mbyte/sec) _______20 Sync
       SPINDLE SPEED (RPM) ______________________7,200
       AVERAGE LATENCY (mSEC) ___________________4.17
       BUFFER ___________________________________1024 KByte
         Read Look-Ahead, Adaptive,
         Multi-Segmented Cache
       INTERFACE ________________________________SCSI-2 FAST WIDE
                                                 ASA
       BYTES PER TRACK __________________________99,536 average
       SECTORS PER DRIVE ________________________3,957,500
       TPI (TRACKS PER INCH) ____________________3,047
       BPI (BITS PER INCH) ______________________52,187
       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) ____________________500,000
       SHOCK (G's):
                operating (Read/Write) __________2
                nonoperating ____________________50
       ACOUSTICS (typ/max dBA) __________________4.7/
       POWER REQUIREMENTS: +12V START-UP (amps) _2.18
                           +12V TYPICAL (amps) __0.83 idle
                           +5V START-UP (amps) __1.0
                           +5V TYPICAL (amps) ___0.76 idle
                           IDLE (watts) _________13.5
       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):     5.97/151.6
                        Weight    (lbs/kg):     2.3/1.04

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. (08/26/94)