************************************************************
                         Miniscribe Disk Drive Specifications
                                        For
                                    Model: 8051A
             ************************************************************

             FORM FACTOR                            3.5 inch HH
             INTERFACE                               16 BIT IDE
             DATA ENCODING METHOD                       2,7 RLL
             DATA TRANSFER RATE (Mbit/Sec)                  8.0

             DISK DRIVE CHARACTERISTICS
                HEADS                                         4
                CYLINDERS                                   745
                SECTORS/TRACK (512 Byte Sectors)             28
                WRITE PRECOMPENSATION CYLINDER            NA***
                REDUCED WRITE CURRENT CYLINDER            NA***
                MINIMUM STEP PULSE RATE                   NA***
                UNFORMATTED BYTES/TRACK                  17,220
                RADIAL TRACK DENSITY (TPI)                1,109
                ROTATIONAL SPEED (RPM)                    3,484
                UNFORMATTED CAPACITY (MBytes)              51.3
                FORMATTED CAPACITY (Millions of Bytes)     42.7
                FORMATTED CAP. (MB = 1,048,576 Bytes)      40.7
                NA*** (NOT APPLICABLE TO IDE DRIVES)

             ACCESS TIMES (mSec)*
                SINGLE TRACK                                  8
                AVERAGE OF ALL POSSIBLE SEEKS                28
                MAXIMUM                                      60
             *(INCLUDES SETTLING)

             POWER REQUIREMENTS
                DISSIPATION (Watts)
                   TYPICAL                                  8.0
                CURRENT (Amps)
                   +5 V DC (+ or - 5%)                      0.5
                   +12 V DC (+ or - 5%)                     0.5
                   MAXIMUM STARTUP CURRENT                  2.0

             PHYSICAL DIMENSIONS
                HEIGHT (in)                               1.625
                WIDTH (in)                                    4
                DEPTH (in)                                 5.75
                WEIGHT (lbs)                               1.43

             OPERATIVE ENVIRONMENTAL LIMITS
                MINIMUM TEMPERATURE (Centigrade)              5
                MAXIMUM TEMPERATURE (Centigrade)             50
                THERMAL GRADIENT (Degrees C/Hour)            10

             RELIABILITY
                MTBF (Hours)                             30,000
                MTTR (Minutes)                               30
                COMPONENT DESIGN LIFE (Years)                 5


                         8051A DUAL DRIVE SUPPORT


The 8051A operates in a MASTER SLAVE relationship. This enables the 8051A to 
be daisy-chained with another IDE drive (i.e. 7080A, 7040A, or another 8051A).

1: Jumpering J4.1 to J4.2 causes the 8051A to operate in the SLAVE role.

2: Jumpering J4.5 to J4.6 causes the 8051A to operate in the MASTER role.
 
3: Jumpering J4.3 to J4.4 This allows the 8051A to be compatable with 
   some BIOS versions that cannot support 1:1 interleave. This jumper 
   should not be installed under normal conditions.

4: Jumper J4.7 to J4.8 is not used and should not be installed.

5: Jumpering J4.9 to J4.10 enables the I/O ready signal onto the 
   interface connector, pin 27.     

To operate the 8051A as the ONLY DRIVE in a system, J4.1 thru J4.10 
should all be open (not jumpered) except as noted below.

NOTE: The 8051A may be shipped with a jumper accross J4.1 and J4.3 
this jumper has no effect but provides you with a spare.