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                      MAXTOR 25252A 2.5-Inch SCSI DRIVE
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KEY FEATURES:
  * 12ms average seek                             * 128K on-board cache  
  * Low power consumption                         * >350,000 hour MTBF
  * 1:1 interleave                                * Automatic actuator lock 
  * Dual drive Master/slave support               * Zone density recording
  * Rotary voice coil

SPECIFICATIONS:
Formatted (MegaBytes) ...................... 251.7  *5
Number of Disks: ........................... 3
Data Surfaces: ............................. 6
Data Heads: ................................ 6
Servo: ..................................... Embedded
Tracks per surface (user) .................. 1,418
Track Density (average) .................... 2,560 tpi
Bytes per Block: ........................... 512
Sectors per track (8 Zones) ................ 43-67
Seek times* (ms)
  Track-to-track ........................... 2.5
  Average .................................. 12**
  Maximum .................................. 22
Average Latency (ms) ....................... 7.064
Rotational speed ........................... 4,247 rpm
Controller overhead (ms) ................... 1
Data transfer rate (Mbytes/sec) 
  To/from media ............................ 2.01-3.13
  To/from buffer (AT) ...................... 9.0
  To/from buffer (synchronous SCSI) ........ 7.5
  To/from buffer (asynchronous SCSI) ....... 3.0
Start time - Power up (0-4,247 RPM)
  Typical .................................. 3.5 sec
Start time - Sleep mode .................... <1.5 sec
Start time - Power down .................... 3 sec
Start/Stop cycles (Typical) ................ 50,000 min
Interleave ................................. 1:1
Buffer size ................................ 128K
Interface .................................. AT or SCSI
Recording method ........................... 1,7 RLL
Recording density (Kbpi) ................... 55.0 (Zone 1)
Flux density (Kfci) ........................ 41.3 (Zone 1)

POWER REQUIREMENTS 
   MODE           +5VDC10%       POWER
  -------------------------------------
  Spin-up ........ 1000mA (peak). 2.8W
  Read/Write ..... 400mA ........ 2.0W
  Idle ........... 320mA ........ 1.6W
  Park ........... 180mA ........ 0.9W
  Standby/Sleep .. 20mA ......... 0.1W

PHYSICAL
  Height ................................. 0.67 in. (17.0 mm)
  Width .................................. 4.00 in. (101.6 mm)
  Depth .................................. 2.75 in. (69.84 mm)
  Weight ................................. 0.419 lbs. (190 gm)

ENVIRONMENTAL 
Temperature 
  Operating .............................. 5C to 50C
  Thermal gradient ....................... 20C/hour max
  Non-operating, Storage 
    Low Temp ....................... -40C Per MIL-STD-810E, Method 502.3
    High Temp ............................ Per MIL-STD-810E, Method 501.3
                                           Hot induced conditions
Humidity
  Operating .............................. Per MIL-STD-810E, Method 507.3
                                           Natural hig humidity, Cycle 3
  Non-operating & storage ................ Per MIL-STD-810E, Method 507.3
                                           Induced conditions, Cycle 5
Altitude (relative to sea level)
  Operating .............................. -200 to 10,000 feet
  Non-operating .......................... Per MIL-STD-810E, Method 500.3
                                           low pressure procedure I-storage
                                           test condition 2, transport air-
                                           craft cargo compartment conditions
Shock & Vibration (typical)
  Non-operating shock .................... 150 Gs, 3 ms & 11 ms half-sine pulse
                                           Per MIL-STD-810E, Method 516.4
                                           Procedure VI - Bench Handling
  Operating shock ........................ 15 Gs, 3 ms & 11 ms half-sine pulse
                                           (Without non-recoverable errors)
  Non-operating vibration
      Per MIL-STD-810E, Method 514.4, Basic transportation vertical axis
      PSD profile (60 Min/Axis)(10-500 Hz)
  Operating vibration
      Swept sine (1 octave/minute)
        5 - 20 Hz  ........ 0.05" (double amplitude)
        20 - 300 Hz ....... 1 G Peak amplitude
        Random Vibration .. Per MIL-STD-810E, Method 514.4
                            Basic transportation vertical axis
                            PSD profile (10-500 Hz)
Acoustic Noise (typical)
      30 dbA (1 meter in idle on-track mode) sound pressure average
      3.40 bel A sound power (per ISO 7779)

RELIABILITY AND QUALITY
MTBF ....................................... >350,000 POH (Power On Hours) *1
AFR ........................................ 0.7% (Annualized Failure Rate)*2
Component design life ...................... 5 years (minimum) *3
AOQL/DPM ................................... 1,500 DPM *4
Preventive Maintenance ..................... None
Data reliability ........................... <10 per 10 to the 13th bits read
                                             (non-recoverable read data errors)

     *   Averages at nominal DC input voltages. Includes mechanical motion
         and servo overhead. Excludes system, adapter, and interface firm-
         ware overhead.
     **  The average of 10,000 random seek times (measured on independent.
         test equipment) constitutes the average seek time specification.
     *1  Annualized average applicable only to the time period after 
         installation to the end of the specified Component Design Life.
         The assumed POH/Year is 2,500 hours.
     *2  Annualized average applicable only to the time period after final
         installation to the end of the specified Component Design Life.
     *3  The period of the before identified wear-out mechanisms will impact
         the annual failure rate.
     *4  Average defects per million rate is measured by our customers 
         through their final installation. Based on failures that are 
         verified as chargeable to Maxtor.
     *5  Maxtor defines a megabyte as 1,000,000.

            25252A and 25252S are trademarks of Maxtor Corporation.
               AT is a registered trademark of IBM Corporation.
               Specifications subject to change without notice.
                      Copyright 1992 Maxtor Corporation.


Revision A                                             Sandoval/Anderson
10/07/93
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