52 MB Smartdrive  (250-4124)    Specifications         Faxback Doc. # 3093

QUANTUM 52AT


        Interface: AT          Avg. Access Time: 17ms
       Drive Type: Non-Std        Transfer Rate: up to 1.75MB/sec
         Capacity: 50 MEG                        (to/from media)
        Cylinders: * 751       Rotational Speed: 3662 RPM +/- 1%
            Heads: * 8           Operating Temp: 39 to 122 F
Sectors Per Track: * 17                    MTBF: N/A
  Tracks Per Inch: 1330       Start Stop Cycles: 10,000 minimum
  Bytes Per Block: 512    DC Power Requirements: 
  Number of Disks: 1                    Voltage- +12vdc    +5vdc
            Style: IDE                 
Read/Write Format: RLL           Current-  Idle: .25amps   .30amps
     Cache Buffer: 64K                  Seeking: .29amps   .14amps
                                       Starting: .80amps   .20amps

* During device installation, use Non-Standard drive type (751 cyl, 8
  heads, and 17 sectors per track).

The 25-4124 supports translation from a logical addressing mode to its
physical parameters.  In the translation mode, the 25-4124 appears to
the host system as having 751 cylinders, 8 heads, and 17 sectors per
track.  In real mode, the drive actually has 1219 cylinders, 4 heads,
and 49, 42, and 35 sectors per track for the outer, middle and inner
zone respectively.

The translation mode is the only way Tandy supports the use of the drive.


(css 07/29/93)