************************************************************
                         Miniscribe Disk Drive Specifications
                                        For
                                    Model: 4020
             ************************************************************

             FORM FACTOR                           5.25 inch FH
             INTERFACE                              ST412/ST506
             DATA ENCODING METHOD                           MFM
             DATA TRANSFER RATE (Mbit/Sec)                  5.0

             DISK DRIVE CHARACTERISTICS
                HEADS                                         4
                CYLINDERS                                   480
                SECTORS/TRACK (512 Byte Sectors)             17
                WRITE PRECOMPENSATION CYLINDER              128
                REDUCED WRITE CURRENT CYLINDER              480
                MINIMUM STEP PULSE RATE (micro-Seconds)       6
                UNFORMATTED BYTES/TRACK                  10,416
                RADIAL TRACK DENSITY (TPI)                  402
                ROTATIONAL SPEED (RPM)                    3,600
                UNFORMATTED CAPACITY (Millions of Bytes)   20.0
                FORMATTED CAPACITY (Millions of Bytes)     16.7
                FORMATTED CAP. (MB = 1,048,576 Bytes)      15.9

             ACCESS TIMES (mSec)*
                SINGLE TRACK                                 18
                ONE-THIRD STROKE**                          133
                MAXIMUM                                     349
             *(INCLUDES SETTLING)
             **(APPROXIMATION OF AVERAGE)

             POWER REQUIREMENTS
                DISSIPATION (Watts)
                   MAXIMUM                                 23.0
                CURRENT (Amps)
                   +5 V DC (+ or - 5%)                      1.5
                   +12 V DC (+ or - 5%)                     1.5
                   MAXIMUM STARTUP CURRENT                  4.5

             PHYSICAL DIMENSIONS
                HEIGHT (in)                                3.25
                WIDTH (in)                                 5.75
                DEPTH (in)                                    8
                WEIGHT (lbs)                                5.5

             OPERATIVE ENVIRONMENTAL LIMITS
                MINIMUM TEMPERATURE (Centigrade)              4
                MAXIMUM TEMPERATURE (Centigrade)             46
                THERMAL GRADIENT (Degrees C/Hour)            10

             RELIABILITY
                MTBF (Hours)                             10,000
                MTTR (Minutes)                               30
                COMPONENT DESIGN LIFE (Years)                 5