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              3.5-INCH FIXED DISK DRIVE
                     OEM MANUAL

                    TOSHIBA AMERICA, INC.
                    DISK PRODUCTS DIVISION

Contents of this manual are subject to change without prior notice.

              Copyright 1987 Toshiba America, Inc.
                      All rights reserved

                                                   Document Number DW32-02-012
                                REVISION RECORD
Edition     Date Published              Revised Contents

    01      September 1987        Initial Release

    02      April 1988            iii, 1-1, 2-1, 2-3, 2-4, 3-1, 3-2, 3-3

     Direct comments concerning this publication to:

                            TOSHIBA AMERICA, INC.
                             Disk Products Division
                                9740 Irvine Blvd.
                                Irvine, CA 92718
                                 (714) 583-3000

     The MK-134FA is designed to comply with UL, CSA and TUV standards.
         Contact Toshiba America, Inc. to obtain additional Information.

                                        -ii-                               MK-134FA OEM Manual
                                      TABLE OF CONTENTS


  1.1 Purpose of Manual                                                 1-1
  1.2 Related Documents                                                 1-1
  1.3 General Description                                               1-2


  2.1   Storage Capability                                              2-1
  2.2   Functional Specifications                                       2-1
  2.3   Environmental Specifications                                    2-2
  2.4   Reliability Characteristics                                     2-3
  2.5   Power Requirements                                              2-4
  2.6   Physical Dimensions, Weight and Mounting                        2-5


  3.1 Mounting Orientation                                              3-1
  3.2 Cooling and Disk Drive Enclosure                                  3-1
  3.3 Indicators                                                        3-1
  3.4 Jumper Functions                                                  3-2
      3.4.1 Write Protect                                               3-2
      3.4.2 Radial/Daisy-Chain Mode                                     3-2
      3.4.3 Terminator                                                  3-2
      3.4.4 Switch 0 through Switch 3                                   3-2
      3.4.5 Write Pre-compensation                                      3-2
      3.4.6 Jumper Selections                                           3-3


  4.1 Control Cable                                                     4-1
  4.2 Data Cable                                                        4-1
  4.3 Control Cable Pin Assignments                                     4-2
  4.4 Data Cable Pin Assignments                                        4-3


  5.1   Soft Sector Formats                                             5-1
  5.2   Definition of Fields                                            5-1


  6.1   Equipment Maintenance                                            6-1
        6.1.1 In-Warranty Maintenance                                    6-1
        6.1.2 Out-of-Warranty Maintenance                                6-1
        6.1.3 Equipment Return Instructions                              6-1

                                                   -iii-   MK-134FA OEM Manual
                                        TABLE LIST

TABLE    TITLE                                                     PAGE

  1      Related Documents                                           1-1
  2      Storage Capability                                          2-1
  3      Functional Specifications                                  2-1
  4      Environmental Specifications                               2-2
  5      Reliability Characteristics                                2-3
  6      Power Requirements                                         2-4
  7      Connector PJ4 Jumper Selections                            3-3
  8      Control Cable Pin Assignments                              4-2
  9      Data Cable Pin Assignments                                  4-3

                                        FIGURE LIST

FIGURE    TITLE                                                    PAGE

  1      Dimensions and Mounting Holes                              2-5
  2      Mounting Orientation                                       3-1
  3      Clearance Requirements                                     3-1
  4      Soft Sector Format                                         5-1

                                             -iv-     MK-134FA OEM Manual
                                             SECTION 1



The purpose of this manual is to describe the MK-134FA 3.5-inch fixed disk drive to the level of detail required
for product integration.

System designers planning to develop a custom controller and others who require additional product
information should refer to the MK-134FA Product Specification for additional product and interfacing details.


Detailed product and interfacing information is given in the MK-134FA Product Specification.

Table 1 lists OEM Manuals that are available for other Toshiba disk products. The MK-134FA is included to
indicate how its storage capacity compares to other disk products available from Toshiba.

  Toshiba          Media          Storage            Unformatted              Type Of           Document
  Product          Size         Technology          Capacity (MB)            Interface           Number

 MK-134FA            3.5          Winchester                 53             ST506/412         DW32-02-012

 MK-50FB            5.25          Winchester            43 to 86            ST506/412         DW54-01-006

 MK-150FA           5.25          Winchester           86 to 173               ESDI            DW54-01-007

 MK-250FA           5.25          Winchester                382.5              ESDI           DW54-01-014

 MK-180FB            8.0          Winchester           83 to 166               SMD            DW80-01-008

 MK-280FC            8.0          Winchester          340 to 510              HSMD            DW80-01-009

 MK-388FA            8.0          Winchester                720               HSMD             DW80-01-013

                                      Table 1 -   Related Documents

 Contact your nearest Toshiba Disk Products Division Sales Representative to order a manual or obtain
 more detailed technical information.

                                                      1-1                                MK-134FA OEM Manual

The MK-134FA is a 3.5-inch Winchester disk drive designed primarily to be incorporated into high perform-
ance desk-top and lap-top computers.

An industry standard ST50S/412 interface provides compatibility with other 3.5-inch and 5.25-inch Winches-
ter storage products and commercially available controllers. The MK-134FA complies with the standard 3.5-
inch mini floppy size, mounting and power requirements.

When used with conventional ST50S/412 controllers, the MK-134FA offers a capacity of 53 megabytes
(unformatted), or 44 megabytes (typical, formatted).

The positioning system utilizes a rotary voice coil actuator to provide a 25 millisecond average seek time and
a 50 millisecond maximum seek time.

To facilitate operation in portable applications, extensive use of VLSI reduces average power consumption
to only 10 Watts.

Careful choice of cylinde r and head configuration allows for direct Operating System compatibility with existing

The Head Disk Assembly (HDA) is enclosed in a die cast aluminum base plate and shroud and incorporates
numerous safety features to maximize reliability:

        The base plate and shroud assembly provides mechnical mounting and EMI (Electro-magnetic
        Interference) shielding for the heads, disks and actuator.

        The sealed assembly incorporates an air recirculatory system and a 0.3 micron lifetime filter
        to ensure a contamination-free environment and even thermal distribution.

        When power is removed, a fail-safe system automatically returns the heads to a dedicated
        landing zone and a solenoid automatically locks the carriage in this location. This prevents
        head and media damage during transit.

Careful planning in regard to the location of components on the circuit card, especially those with electrical
noise potential, contributes to very low levels of read channel noise and enhances data recovery.

MK-134FA OEM Manual                                    1-2
                                                       SECTION 2


                                   STORAGE CAPACITY                               MK-134FA

                                   Unformatted Capacity                            53.4 MB

                                   Number of Disks                                     4
                                   Number of Data ReadIWrite Heads                     7

                                                   Table 2 - Storage Capability


      Number of Cylinders                                                                               733

      Tracks per Inch                                                                                  930 TPI

      Bits per Inch                                                                                     9,383

      Flux Changes per Inch                                                                             9,383

      MFM Data Transfer Rate                                                                  5.0 Megabits per Second

      Head Recovery Time:
           Head Change                                                                            13 Microseconds
           Write to Read                                                                           8 Microseconds

      Seek Time:

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