SEAGATE TECHNOLOGY, INC.
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     Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
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                            (C)opyright 1991



ST-125 ST412 MFM
                                                            /───┐
                                                            │ 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 - 125

       UNFORMATTED CAPACITY (MB) ________________25.6
       FORMATTED CAPACITY (17 SECTORS) (MB) _____21.4
       ACTUATOR TYPE ____________________________STEPPER
       TRACKS ___________________________________2,460
       CYLINDERS ________________________________615
       HEADS ____________________________________4
       DISCS ____________________________________2
       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 ________________________41,820
       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 ________________________6

       *ST125-0/ST125-1

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