SEAGATE TECHNOLOGY, INC.
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                           (C)opyright 1991



ST-277R ST412 RLL

                                                         /�4�3�2�1�\
                                                         � O O O O � Power
             o o o o o o o o                             �����������
 �Data Cable o o o o o o o o  �Controller Cable    1       5 G G 12
��������� �� � � � � � � � � �������������������� ���   ������������
             � � � � � � � � 1�����������Ŀ
             � � � � � � � � ��Terminator��
             � � � � � � � �
Drive Select->1 2 3 4 � � � � Radial
               � � � � � ��� Reserved
               � ��� � ����� Write Fault
               �  �  ������� Factory Test
               �  ���������� Never Used (Drive Select 3 and 4)
               � If twisted cable, use Drive Select 2

                         ST - 277R

      UNFORMATTED CAPACITY (MB) ________________76.9
      FORMATTED CAPACITY (26 SECTORS) (MB) _____65.5
      ACTUATOR TYPE ____________________________STEPPER
      TRACKS ___________________________________4,920
      CYLINDERS ________________________________820
      HEADS ____________________________________6
      DISCS ____________________________________3
      MEDIA TYPE _______________________________THIN FILM
      RECORDING METHOD _________________________RLL (2,7)
      TRANSFER RATE (mbits/sec) ________________7.5
      SPINDLE SPEED (RPM) ______________________3,600
      AVERAGE LATENCY (mSEC) ___________________8.3
      INTERFACE ________________________________ST412
      SECTORS PER DRIVE ________________________127,920
      TPI (TRACKS PER INCH) ____________________777
      BPI (BITS PER INCH) ______________________14,902
      AVERAGE ACCESS (ms)*______________________40/28
      SINGLE TRACK SEEK (ms) ___________________8
      MAX FULL SEEK (ms) _______________________ /70
      MTBF (power-on hours) ____________________70,000
      POWER REQUIREMENTS: +12V START-UP (amps) _2.0/2.5*
                          +12V TYPICAL (amps) __0.5
                          +5V TYPICAL (amps) ___1.0/1.2*
                          TYPICAL (watts) ______11/12*
                          MAXIMUM (watts) ______29/36*
      BUFFERED STEP PULSE RATE (micro sec) _____3-200
      WRITE PRECOMP (cyl) ______________________N/A (821)
      REDUCED WRITE CURRENT (cyl) ______________N/A (821)
      LANDING ZONE (cyl)________________________AUTO PARK
      IBM AT DRIVE TYPE  _______________________**

      *ST277R-0/ST277R-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)


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