************************************************************
                         Miniscribe Disk Drive Specifications
                                        For
                                    Model: 8425XT
             ************************************************************

             FORM FACTOR                            3.5 inch HH
             INTERFACE                            INTEGRATED XT
             DATA ENCODING METHOD                           MFM
             DATA TRANSFER RATE (Mbit/Sec)                  5.0

             DISK DRIVE CHARACTERISTICS
                HEADS                                         4
                CYLINDERS                                   615
                SECTORS/TRACK (512 Byte Sectors)             17
                UNFORMATTED BYTES/TRACK                  10,416
                RADIAL TRACK DENSITY (TPI)                  804
                ROTATIONAL SPEED (RPM)                    3,600
                UNFORMATTED CAPACITY (MBytes)              25.6
                FORMATTED CAPACITY (MBytes)                21.4

             ACCESS TIMES (mSec)*
                SINGLE TRACK                                 15
                ONE-THIRD STROKE**                           68
                MAXIMUM                                     150
             *(INCLUDES SETTLING)
             **(APPROXIMATION OF AVERAGE)

             POWER REQUIREMENTS
                DISSIPATION (Watts)
                   TYPICAL                                 12.0
                   LOW POWER OPTION                         7.0
                CURRENT (Amps)
                   +5 V DC (+ or - 5%)                     0.55
                   +12 V DC (+ or - 5%)                    0.75
                   MAXIMUM STARTUP CURRENT                  2.0

             PHYSICAL DIMENSIONS
                HEIGHT (in)                               1.625
                WIDTH (in)                                    4
                DEPTH (in)                                 5.75
                WEIGHT (lbs)                                1.8

             OPERATIVE ENVIRONMENTAL LIMITS
                MINIMUM TEMPERATURE (Centigrade)              4
                MAXIMUM TEMPERATURE (Centigrade)             50
                THERMAL GRADIENT (Degrees C/Hour)            10

             RELIABILITY
                MTBF (Hours)                             20,000
                MTTR (Minutes)                               30
                COMPONENT DESIGN LIFE (Years)                 5