SEAGATE TECHNOLOGY, INC.
Technical Support Bulletin Board
408/438-8771  [300-9600 HST, MNP 3/5, N-8-1]
(C)opyright  1990                               

			ST-157A

                                     /ΔΔΔΔΔΔΔ\
                                     ³O O O O³
                                     ΐ5ΔGΔGΔ12
         ΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝΝ
          o o o  ....................1
          o o o  ....................
          ³ ³ ³
          ³ 0 1  Single Drive            0=open
          ³ 1 1  Dual-Drive Master       1=closed
          ³ 1 0  Dual-Drive Slave
          ³
          ΐΔΔΔΔΔ Optional External LED


                          ST - 157A

       UNFORMATTED CAPACITY (MB) ________________57
       FORMATTED CAPACITY (26/17 SECTORS) (MB) __44.7
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________3,360
       CYLINDERS ___PHYSICAL/LOGICAL_____________560/1024
       HEADS _______PHYSICAL/LOGICAL_____________6/5
       DISCS ____________________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________RLL
       TRANSFER RATE (mbits/sec) ________________7.5
       INTERFACE ________________________________AT BUS
       TPI (TRACKS PER INCH) ____________________824
       BPI (BITS PER INCH) ______________________20,280
       AVERAGE ACCESS (ms) ______________________40/28*
       SINGLE TRACK SEEK (ms) ___________________8
       MTBF (power-on hours) ____________________70,000
       POWER REQUIREMENTS: +12V START-UP (amps) _2.0
                           +12V TYPICAL (amps) __0.35
                           +5V TYPICAL (amps) ___0.9
                           TYPICAL (watts) ______9
                           MAXIMUM (watts) ______29
       BUFFERED STEP PULSE RATE (micro sec) _____3-200
       WRITE PRECOMP (cyl) ______________________N/A (561)
       REDUCED WRITE CURRENT (cyl) ______________N/A (561)
       LANDING ZONE (cyl)________________________AUTO PARK
       IBM AT DRIVE TYPE ________________________**

       *ST157A-0/ST157A-1
       **MAY REQUIRE PARTITIONING SOFTWARE

PHYSICAL/LOGICAL equivalent to NATIVE/TRANSLATION
Already low-level formatted at the factory.

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