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                         SEAGATE TECHNOLOGY, INC.
                              1-800-SEAGATE
                          http://www.seagate.com
                            (C)opyright 1991



ST-138 ST412 MFM
                                                            /ÄÄÄ¿
                                                            ³ O ³12
                                                            ³ O ³G
                                                            ³ O ³G
                                                            ³ O ³5
      ÚData Cable            ÚController Cable    1         \ÄÄÄÙ
      ÍÍÍÍÍÍÍÍÍ ÍÍ          ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ ÍÍÍ   ÍÍÍÍÍÍÍÍÍÍÍÍ
              1 o o o o o o o ÚÄÄÄÄÄÄÄÄÄÄÄÄ1
              o o o o o o o o ÀÄÄÂÄÄÄÄÄÄÄÄÄÙ
              ³ ³ ³ ³ 4 3 2 1    À Resistor Termination Pack
              ³ ³ ³ ³ ÄÄÄÂÄÄÄ
              ³ ³ ³ ³    ³
              ³ ³ ³ ³    ÀÄÄÄÄ Drive Selects
              ³ ³ ³ ÀÄÄÄÄÄÄÄÄÄ Factory Test
              ³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄ Write Fault
              ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄ Not Used
              ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ 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 - 138

       UNFORMATTED CAPACITY (MB) ________________38.4
       FORMATTED CAPACITY (17 SECTORS) (MB) _____32.1
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________3,690
       CYLINDERS ________________________________615
       HEADS ____________________________________6
       DISCS ____________________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________MFM
       TRANSFER RATE (mbits/sec) ________________5.0
       SPINDLE SPEED (RPM) ______________________3,600
       AVERAGE LATENCY (mSEC) ___________________8.3
       INTERFACE ________________________________ST412
       SECTORS PER DRIVE ________________________62,730
       TPI (TRACKS PER INCH) ____________________824
       BPI (BITS PER INCH) ______________________14,953
       AVERAGE ACCESS (ms)*______________________40/28
       SINGLE TRACK SEEK (ms) ___________________8
       MAX FULL SEEK (ms) _______________________70
       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 ________________________3

       *ST138-0/ST138-1

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

A copy of this specification file may be obtained by FTP at
ftp://ftp.seagate.com/techsuppt/mfm/st138.txt.