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			     7425AV IDE DRIVE
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KEY FEATURES:

  * 12ms average seek               * 32K on-board buffer
  * Low power consumption           * Zone density recording 
  * 1:1 interleave                  * Dual drive master/slave support 
  * Rotary voice coil               * Automatic actuator lock 
  * Single-sided surface mount PCBA * 3551 RPM Rotational speed              
  * Energy Star compliant           * Multi-Word DMA Mode 1

SPECIFICATIONS:

Formatted capacity: ........................ 426,997,760 Bytes
Bytes per sector:........................... 512
Integrated Controller/Interface: ........... AT 
Actuator type: ............................. Rotory Voice Coil
Data Surfaces: ............................. 2
Data Heads: ................................ 2
Servo: ..................................... Embedded
Tracks per surface (user): ................. 3,709
Track Density (tpi): ....................... 3,200 maximum
Flux Density (kfci): ....................... 55.40 maximum
Encoding Method: ........................... RLL 1,7
Data Zones per Surface: .................... 10
Buffer Size: ............................... 64K
Interleave: ................................ 1:1


PERFORMANCE:
Seek performance (including settling time and servo overhead)*

Seek times* (ms)
     Track to track: ....................... 3
     Average: .............................. 12 **
     Maximum: .............................. 31

Average latency (ms): ...................... 8.45
Spindle speed (+-0.1%): .................... 3551 RPM
Controller overhead: ....................... 0.5 ms

Data transfer rate (Mbytes per sec)
  To/From Media (MB/sec): .................. 2.87 - 5.36
  To/from Host (without I/O CHRDY): ........ PIO Mode 3, 11.11MBs, 180ns
  To/from Host (with I/O CHRDY): ........... 13.33MBs, 150ns
  DMA Transfers (sustained) ................ Mode 0
  DMA Transfers (burst) .................... Mode 1

Start time (0 - Drive Ready) 
  Average .................................. <=9  sec
  Maximum .................................. <=20 sec
Stop Time/Power Down: 
  Average .................................. <=3.5 sec
  Maximum .................................. <=5   sec


Power Requirements - Single Disk (Average)

    Mode         +12VDC +-8%  +5VDC +-5%  Power/Duration
    ----         -----------  ----------  --------------
    Spin-up        705mA       345mA        10.10W 1 sec max.
    Read/Write     169mA       325mA         3.65W
    Active         178mA       321mA         3.74W
    Idle           139mA       319mA         3.26W
    Standby          1mA        91mA         0.47W
    Sleep            1mA        63mA         0.33W

Maximum power supply ripple allowed: 100mV peak to peak, 0-2MHz

Power Mode Definitions:

Spin-up     The drive is spining up following initial application 
	    of power and has yet not reached full speed. Maximum
	    current draw lasts 1 second.

Read/Write  Data is being read or written to the drive.

Active      The drive is spinning and most circuitry is powered on. 
	    The drive is capable of responding to read commands in
	    the shortest possible time. Read/Write heads are positioned
	    over the data area.

Idle        The drive is spinning., the actuator is parked and powered
	    off, and all other circuitry is powered on. The drive is 
	    capable of responding to read commands within 40ms.

Standby     The spin motor is not spinning. The drive will leave this
	    mode upon receipt of a command that requires disk access.
	    The time-out value for this mode is programmable. The
	    buffer is active to accept write data.
	    A program called GREENDRV.ZIP is available on the Maxtor
	    BBS (303-678-2222), that will allow you to program this 
	    delayed standby mode.

Sleep       This is the lowest power state. The interface becomes 
	    inactive. A software or hareware reset is required to 
	    return the drve to Standby.


Physical:

    Height:  1.00"  ( 25.4 mm)
    Length:  5.75"  (146.1 mm)
    Width:   4.00"  (101.6 mm)
    Weight:  1.2 lb.  (0.5 kg)

Environmental:

Temperature (Degrees C)
    Operating (stabilized).................. 5C to 55C 
					     Thermal gradient 20C/Hr max
    Non-operating/Storage .................. -40C to 71C

Humidity ***
    Operating .............................. 5% to 95% non-condensing
    Non-operating/Storage .................. 5% to 95% non-condensing

Thermal Shock
    Low Temperature (-20C to +25C) .......... MIL-STD-810E Method 503.3
    High Temperature & Humidity ............. MIL-STD-810E Method 503.3
    (+35C, 80%RH to +25C, 50%RH)

Altitude (relative to sea level)
    Operating .............................. -200 to 10,000 feet
    Non-operating .......................... MIL-STD-810E Method 503.3
    
Reliability and Maintenance:

MTBF ....................................... >300,000 hours 
Preventative Maintenance ................... None
Component design life ...................... 5 years (minimum)
Data reliability............................ <10 per 10^12 bits read
Start/Stop Cycles........................... > 20,000
Shock & Vibration (typical)
	  
    Operating Shock ........................ 15 Gs
    Non-Operating Shock .................... 70Gs
    
    Operating Vibration (without non-recoverable errors)
      10Hz   ............................... .004 GxG/Hz
      40Hz.................................. .004 GxG/Hz
     500Hz.................................. .00004 GxG/hz

      Non-operating Vibration (without non-recoverable errors)
      10Hz.................................. .0015 GxG/Hz
      40Hz.................................. .0015 GxG/Hz
     500Hz.................................. .000015 GxG/hz

      20-300 Hz ............................ 1.0 G peak

Acoustic Noise
    Sound power (per ISO 7779) ............. 3.5 belA

*   At nominal DC input voltages
**  The average of 10,000 random seek times (measured on independent
    test equipment) constitutes the average seek time specification.
*** Operating and non-operating specs meet MIL-STD-810E. 
    Method 507.3 Table 507.3-I High humidity diurnal category. 
    Natural, High Humidity, Cyclic (Cycle 3)

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		       7425AV JUMPER DESIGNATION
					    |J24|J23|J20|
      +-------------------------------------------------+
      | Cable Select                        |   |   |   |
      |  Disabled*                          | O |   |   |
      |  Enabled                            | J |   |   |
      +-------------------------------------------------+
      | Write Cache                         |   |   |   |
      |  Enabled*                           |   | O |   |
      |  Disabled                           |   | J |   |
      +-------------------------------------------------+
      | Master/Slave                        |   |   |   |
      |  Only drive in single drive system* |   |   | J |
      |  Master in dual drive system*       |   |   | J |
      |  Slave in dual drive system         |   |   | O |
      +-------------------------------------------------+
	 J=Jumpered O=Open *=Default                      
	 Note: Jumper J21 & J22 are factory reserved. Do not use. 
	       A spare shunt is shipped between J23 & J24.
							   
+----\    /---------------\    /--\   /-------------\      /--\   /--------+
|     ----                 ----    ---               ------    ---         | 
|                                                          +------+     +---+
|  +                    V--------------------------------> ||:::::|     |   |
|              +-----------------+                         +------+     |   |
|              |     J21 J23     |                            +         |   |
|              |  +-----------+  |                                      |   |
|              |  | * 0 0 *** |  |                                      |   |
|              |  | * 0 0 0 0 |  |                                      |J1 |
|              |  +-----------+  |                                      |   |
|              |   J20 J22 J24   |                                      |   |
|              +-----------------+                                      |   |
|                                              +                        |   |
|                                                                       |   |
|                                                                       |   |
|                                                                       +---|
|                                                                      +----|
|    +                                                            +    |    |
|                                                                      |    |
|                                                                      | J2 |
|     ----                 ----    ---               ------    ---     |    |
+----/    \---------------/    \--/   \-------------/      \--/   \---------+
			    
			    CMOS Configuration:     

		    Cyls   Hds  Write  Landing Sec/Trk
				PreComp  Zone
		    ----------------------------------
		    1000   16     0       0       52

			Yields: 426 Million Bytes 
			which equals 406.2 Megabytes

	    7850AV & 7425AV are trademarks of Maxtor Corporation.
	       AT is a registered trademark of IBM Corporation.
	       Specifications subject to change without notice.
		    Copyright 1994, 1994 Maxtor Corporation.
			Rev D    3/30/95    Anderson
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