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                      MAXTOR MXT-1240S DISK DRIVE (SCSI)
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KEY FEATURES:

  * 8.5 ms avg read seek                      * 8-point shock mounting system                          
  * 9.0 ms avg write seek                     * No sway space required
  * SCSI command overhead of <= 300usec       * Self-test diagnostics
  * Synchronous SCSI-2 fast transfer rates    * Mechanically and thermally
    to 10MBytes/sec, with 15 byte offset        isolated head-disk environment
  * Disk transfer rate to 44.4 Mbits/sec,     * Allows various sector sizes
    buffer to disk                            * Firmware downloadable via SCSI   
  * Advanced buffer implementation              interface
    - 256 KB mulit-segmented read ahead       * 16-bit/35-Mhz processor
    - Write stacking capability               * Hard sectored zoned density
    - Tagged command queuing                    recording
  * SCSI-2 compliance                         * 8-zone recording format
  * 88-bit ECC for high data reliability      * 1,7 RLL data encoding for
    with on the fly correction capability       improved windows margins
  * Power-down braking with positive head     * Brushless in-hub spindle motor
    parking and latching                      * Sealed HDA
  * Surface mounted components with high
    degree of integration for high reliability


SPECIFICATIONS:

Formatted: ................................. 1,240 Million bytes
Embedded Controller: ....................... SCSI 
Number of Disks: ........................... 8
Data Surfaces: ............................. 16
Data Heads: ................................ 15
Servo Heads: ............................... 1
Physical tracks: ........................... 37,689 
Bytes per Block: ........................... 512
Sectors per track: ......................... 44-85
Physical cylinders: ........................ 2,512 

PERFORMANCE (Typical):

Seek times* (ms), typical
     Track to track: ....................... <1.5
     Read: ................................. 8.5 
     Write: ................................ 9.0
     Maximum: .............................. 20

Command overhead (usec): ................... 300 **

SCSI-bus transfer rate (Mbytes/sec)
     Asynchronous: ......................... Up to 5.0
     Synchronous: .......................... Up to 10.0

Disk transfer rate (Mbits/sec) ............. 22.7-44.7
                                                      
Average latency (ms) ....................... 4.76
Rotation speed ............................. 6,300RPM .5%

Interleave: ................................ 1:1

PHYSICAL

    Height:  1.625 in. (41.3 mm)
    Width:   4.00 in. (101.6 mm)
    Depth:   5.750 in. (146 mm)
    Weight:  2.2 lbs. (1 kg)

Environmental:

Temperature 
    Operating .............................. 5C to 55C
    Non-operating .......................... -40C to 65C 
    Thermal gradient ....................... 20C per hour max

Humidity
    Operating .............................. 5% to 95% non-condensing
    Non-operating .......................... 5% to 90% non-condensing
    Maximum gradient/hr .................... 20%
    Maximum wet bulb ....................... 27.6C 

Reliability and Maintenance:

MTBF ....................................... >300,000 hours 
Preventative Maintenance ................... None
MTTR ....................................... 30 minutes
Component design life ...................... >5 years 
Recoverable error rate ..................... 10 in 10 to the 13th ***
Unrecoverable error rate ................... 10 in 10 to the 17th ***
Seek error rate ............................ 10 in 10 to the 7th

Shock & Vibration (typical)
    Operating shock ........................ 3 Gs (no errors)
    Non-operating shock .................... 50 Gs 
    Operating (recoverable errors) ......... 10

Power dissipation (typical) ................ 13 Watts
Audible noise @ 1 foot ..................... 30 dBA

Power requirements

+12 VDC 5%, .79A (typical)  2.5A (maximum)
+5 VDC 5%, .81A (typical)

SCSI-BUS COMMAND SET

Format Unit                       Reserve
Inquiry                           Rezero Unit
Mode Select                       Seek
Mode Sense                        Seek (Extended)
Read                              Send Diagnostics
Read Capacity                     Start/Stop Unit
Read Data Buffer                  Test Unit Ready
Read Defect Data                  Verify
Read (Extended)                   Write
Read Long                         Write and Verify
Reassign Block                    Write Data Buffer
Release                           Write (Extended)
Request Sense                     Write Long request

*   Includes settling
**  Includes arbitration, message transfer, command transfer, command
    interpretation, status interpretation, and the posting of status.
*** With default errors recovery parameters

               MXT is a trademark of Maxtor Corporation.
              Specifications subject to change without notice.

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MFG

OS

ABC-Hotline
Billstr. 236
20539 Hamburg
per Fax
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