ST-125 ST412 MFM

                                                            /---+
                                                            | O |12
                                                            | O |G
                                                            | O |G
                                                            | O |5
      +Data Cable            +Controller Cable    1         \---+
      --------- --          -------------------- ---   ------------
              o 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

                          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)


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