SEAGATE TECHNOLOGY, INC.
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                            (C)opyright 1991



ST-157R ST412 RLL
                                                            /��Ŀ
                                                            � O �12
                                                            � O �G
                                                            � O �G
                                                            � O �5
      �Data Cable            �Controller Cable    1         \����
      ��������� ��          �������������������� ���   ������������
              1 o o o o o o o �������������1
              o o o o o o o o ��������������
              � � � � 4 3 2 1    � Resistor Termination Pack
              � � � � �������
              � � � �    �
              � � � �    ����� Drive Selects
              � � � ���������� Factory Test
              � � ������������ Write Fault
              � �������������� Not Used
              ���������������� Radial

Note: Some configurations have the drive select jumper block oriented
      perpendicular to the back of the drive. In this configuration,
      pin-1 (radial select) is closest to the front faceplate of the
      drive.

                           ST - 157R

       UNFORMATTED CAPACITY (MB) ________________57.7
       FORMATTED CAPACITY (26 SECTORS) (MB) _____49.1
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________3,690
       CYLINDERS ________________________________615
       HEADS ____________________________________6
       DISCS ____________________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________RLL
       TRANSFER RATE (mbits/sec) ________________7.5
       SPINDLE SPEED (RPM) ______________________3,600
       INTERFACE ________________________________ST412
       TPI (TRACKS PER INCH) ____________________824
       BPI (BITS PER INCH) ______________________22,430
       AVERAGE ACCESS (ms)*______________________40/28
       SINGLE TRACK SEEK (ms) ___________________8
       MTBF (power-on hours) ____________________150,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.0
                           +12V TYPICAL (amps) __0.35
                           +5V TYPICAL (amps) ___0.8
                           TYPICAL (watts) ______8
                           MAXIMUM (watts) ______28
       BUFFERED STEP PULSE RATE (micro sec) _____3-200
       WRITE PRECOMP (cyl) ______________________N/A (616)
       REDUCED WRITE CURRENT (cyl) ______________N/A (616)
       LANDING ZONE (cyl)________________________AUTO PARK
       IBM AT DRIVE TYPE ________________________**

       *ST157R-0/ST157R-1

 * MAY REQUIRE A CONTROLLER WITH BIOS SUPPORT, OR FORMATTING
   AND PARTITIONING SOFTWARE.  ALSO, CHECK TO SEE IF YOUR CMOS SETUP
   HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE AVAILABLE.

Seagate reserves the right to change, without notice, product
offerings or specifications. (6/26/90)