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) ____________________150,000
       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 ________________________36, **

       *ST157A-0/ST157A-1

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

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

Since a User-definable or Custom translation geometry may
be used, it is imperative that the values be written down
and kept with your permanent records for retrieval in the
event of CMOS battery failure.

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