SEAGATE TECHNOLOGY, INC.
       Customer Technical Support FAX Network +1 408 438-8137
     Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
┌──────────────────────────────────┬─────────────────────────────────┐
│ United States    +1 408 438-8771 │  United Kingdom +44 628 478011  │
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│ Germany         +49  89 140-9331 │  Singapore      +65   227-2217  │
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                            (C)opyright 1991



ST-4051 ST412 MFM

                                                          /─4─3─2─1─\
                                                          │ O O O O │ Power
                                                          └─────────┘
 ┌Data Cable                                        1       5 G G 12
 ═════════ ══                 ════════════════════ ═══   ════════════
              o o o o o o o o    ┌1     └Controller Cable
              o o o o o o o o    ││
Drive Select->1 2 3 4 │ │ │ │    │├─ Resistor Termination Pack
                │ │ │ │ │ │ │    ││
                │ └┬┘ │ │ │ │    └┘
                │  │  │ │ │ │
                │  │  │ │ │ │
                │  │  │ │ │ └ Radial
                │  │  │ │ └── Recovery Mode
                │  │  │ └──── Write Fault
                │  │  └────── Not Connected
                │  └───────── Never Used (Drive Select 3 and 4)
                └ If twisted cable, use Drive Select 2

                              ST - 4051

       UNFORMATTED CAPACITY (MB) ________________50.88
       FORMATTED CAPACITY (17 SECTORS) (MB) _____42.52
       ACTUATOR TYPE ____________________________VOICE COIL
       TRACKS ___________________________________4,885
       CYLINDERS ________________________________977
       HEADS ____________________________________5
       DISCS ____________________________________3
       MEDIA TYPE _______________________________THIN FILM
       RECORDING METHOD _________________________MFM
       TRANSFER RATE (mbits/sec) ________________5.0
       SPINDLE SPEED (RPM) ______________________3,600
       INTERFACE ________________________________ST412
       TPI (TRACKS PER INCH) ____________________960
       BPI (BITS PER INCH) ______________________9,720
       AVERAGE ACCESS (ms) ______________________40
       SINGLE TRACK SEEK (ms) ___________________8
       MTBF (power-on hours) ____________________15,000
       POWER REQUIREMENTS: +12V START-UP (amps) _4.0
                           +12V TYPICAL (amps) __1.5
                           +5V TYPICAL (amps) ___1.5
                           TYPICAL (watts) ______25.5
                           MAXIMUM (watts) ______55
       BUFFERED STEP PULSE RATE (micro sec) _____10-70
       WRITE PRECOMP (cyl) ______________________N/A (978)
       REDUCED WRITE CURRENT (cyl) ______________N/A (978)
       LANDING ZONE (cyl)________________________AUTO PARK
       IBM AT DRIVE TYPE ________________________11 or 17*

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

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