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          Miniscribe Disk Drive Specifications
                 MAXTOR 8051A IDE Drive
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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 across 
J4.1 and J4.3 this jumper has no effect but provides 
you with a spare.


Revision A                                     Sandoval/Anderson
10/07/93