===============================================================================
                             7273A IDE DRIVE
===============================================================================

KEY FEATURES:

  * 12ms average seek               * 256K on-board multi-segmented cache  
  * 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 * 4500 RPM Rotational speed 
  * Energy Stary compliant          * Multi-Word DMA Mode 1
  * Certified Windows NT Compatible * 

SPECIFICATIONS:

Formatted capacity: ........................ 273,580,032 Bytes
Bytes per sector:........................... 512
Integrated Controller/Interface: ........... AT 
Actuator type: ............................. Voice Coil
Number of Disks: ........................... 1
Data Surfaces: ............................. 2
Data Heads: ................................ 3
Servo: ..................................... Embedded
Tracks per surface (user): ................. 2,771
Tracks per surface (total): ................ 2,793
Sectors per surface (user): ................ 537,878
Sectors per surface (total): ............... 547,876
Track Density (average): ................... 3,050 tpi
Flux Density (average): .................... 51.4 kfci
Data Zones per Surface: .................... 8

Sectors per track:
        Zone 1 .................... 114
        Zone 2 .................... 112
        Zone 3 .................... 108
        Zone 4 .................... 102
        Zone 5 ....................  96
        Zone 6 ....................  88
        Zone 7 ....................  80
        Zone 8 ....................  72

PERFORMANCE (Typical):

Seek times* (ms)
     Track to track: ....................... 1.5
     Average: .............................. 12 **
     Maximum: .............................. 28

Average latency (ms): ...................... 6.66
Spindle speed (+-0.1%): .................... 4,500 RPM
Controller overhead: ....................... 0.4 ms

Data transfer rate (Mbytes per sec)
  To/From Media (MB/sec): .................. 3.5 - 5.6
  To/from Interface (AT Peak Burst): ....... 11.1

Start time (0 - Drive Ready). .............. 6 sec Avg.
Start Time (from sleep mode): .............. 6 sec Avg.
Stop Time/Power Down: ...................... 3 sec Avg.


Power Requirements (Average):

    Mode         +12VDC +-8%  +5VDC +-5%  Power/Duration
    ----         -----------  ----------  --------------
    Spin-up       1500mA       100mA      18.5W/3 sec max.
    Seek           333mA       200mA       5.0W
    Read/Write     220mA       200mA       3.7W
    Idle           210mA       200mA       3.7W
    Park           150mA       100mA       2.3W
    Standby/Sleep   40mA        50mA       0.7W

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 50C
    Non-operating .......................... -40C to 71C
    Thermal Gradient ....................... 20 C per hr

Humidity ***
    Operating .............................. 5% to 95% non-condensing
    Non-operating .......................... 5% to 95% non-condensing
    Maximum wet bulb ....................... 27.6  
    Maximum Gradient / hr .................. 20%

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

MTBF ....................................... >300,000 hours 
Preventative Maintenance ................... None
Component design life ...................... 5 years (minimum)
Data reliability............................ <10 per 10^13 bits read
Seek Error Rate ............................ <=10^7
Shock & Vibration (typical)
          
    Operating Shock ........................ 10 Gs, 11ms (no errors)
    Non-Operating Shock .................... 70Gs
    
    Operating Vibration (without non-recoverable errors)
      5-20Hz ............................... .049"
      20-300Hz ............................. 1.5G

      Non-operating Vibration (without non-recoverable errors)
      5-20 Hz ............................... .05"
      20-300 Hz ............................. 1.0 G peak

Acoustic Noise
    Sound power (per ISO 7779) ............. 3.9 belA
    Sound pressure ......................... 32.2 dBA

*   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)

==============================================================================

         7273A JUMPER DESIGNATION         J24J23J20J19J18J16
    +-------------------------------------+---+---+---+---+---+---
     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          
    +-------------------------------------+---+---+---+---+---+---
     Deffered Spin up                                      
      Spin drive on power up*                      O       
      Defer spin until 1st read/write              J       
    +-------------------------------------+---+---+---+---+---+---
     Low Power Spin Mode                                   
      Disabled*                                       O    
      Enabled                                         J    
    +-------------------------------------+---+---+---+---+---+---
     I/O Channel Ready                                     
      Disabled                                           O 
      Enabled*                                           J 
    +-------------------------------------------------------------+
         J=Jumpered O=Open *=Default                      
         Note: Jumpers J25, J22, and J17 factory reserved. Do not use.
               The jumper located on the ground pins of J22 & J23
               is a spare.

+-----+  +------------------+     +--+  +-------------+     +--+  +---------+
     +--+                  +-----+  +--+             +-----+  +--+         ++
                                                            +----+       +---+
 +              +------------------------------------------>::::          
        +----------------+                                  +----+          
             J24 J22                                         +   +--+     
          +---+---+-+                                            ,,     
           * * ===               +---------------------------->::     
           * * * *       +---------------+                     ;;  J1 
          +-+---+---+          +-----+                         +--+     
           J25 J23          J20+ ===                                   
        +----------------+        * * +J19+                              
                              J18+ * *       +                           
                                  * * +J17                               
                              J16+ ===                                   
       +                         +-----+                               +---+
                             +---------------+                          +----+
                                                                   +        
                                                                            
                                                                         J3 
    +--+                 +-----+   +--+                +----+  +--+         
+----+  +-----------------+     +---+  +----------------+    +--+  +----------+


                         7373A CMOS Configuration:     

                    Cyls   Hds  Write  Landing Sec/Trk
                                PreComp  Zone
                    ----------------------------------
                    1012   16     0       0       33

            Yields: 273 Million Bytes (Approx. 260.9 MegaBytes)


                 7273A are trademarks of Maxtor Corporation.
               AT is a registered trademark of IBM Corporation.
               Specifications subject to change without notice.
                     Copyright 1993-95 Maxtor Corporation.
                        Rev C    11/4/94    Anderson
==============================================================================

