==============================================================================
                                   XT-8760SH
===============================================================================
                                                                        
SPECIFICATIONS:
                    

Typical formatted capacity (MBytes)         676
Embedded Controller                         SCSI 2
Actuator Type                               Voice Coil
Number of Disks                             8
Data Surfaces                               15
Data Heads                                  15
Servo                                       1
Tracks per Surface                          1,632
Track Density (Avg.)                        1,376 tpi
Track Capacity (formatted)                  27,648 bytes
Bytes per Block                             512
Sectors per Track                           54

PERFORMANCE

Seek Times (ms)
  Track to Track                            3.0
  Average                                   14.5
  Maximum                                   28.5
Rotation Speed (+/- 5%)                     3600
Data Transfer Rate                          
 (MBytes per sec)
  To/From Buffer                            4.8

POWER REQUIREMENTS                 +12V DC +/-5%   +5V DC +/-5%   POWER

PHYSICAL
Height                                      3.25 in
Length                                      8.20 in
Width                                       5.75 in
Weight                                      7.10 lb

ENVIRONMENTAL

Temperature
  Operating                                 -50deg F to 122deg F
  Non-operating                             -40deg F to 149deg F
  Thermal Gradient                           18deg F/hour
Humidity
  Operating                                 8% to 80%
  Non-operating                             8% to 80%
  Maximum Wet Bulb                          26.7deg C
Altitude (relative to sea level)
  Operating                                 -1,000ft to 10,000ft
  Non-operating                             -1,000ft to 40,000ft

RELIABILITY and MAINTENANCE

MTBF                                        150,000
MTTR                                        30 minutes
Preventitive maintenance                    none
Component Design Life                       5 years
Data Reliability
  Soft read errors                          < 10 per 10^11 bits read
  Hard read errors                          < 10 per 10^15 bits read
  Seek Errors                               < 10 per 10^7 seeks

SHOCK and VIBRATION           
shock measured a half-sine pulse. Vibration measured at swept sine,
1 Octave per minute.

Non-operating shock                         25g
Operating Shock                             5g
                              

Non-operating Vibration
  5-31 Hz                                   0.02in. P-P
  31-500 Hz                                 1G peak acceleration
Operating Vibration
  5-40 Hz                                   0.006in. P-P 
  40-300 Hz                                 .5G peak acceleration


Default jumpers are shown by , open jumpers are shown by  

                                                    default  #  Function
Ŀ
                                                      in  JP14 Spin when
                                                                power applied
                                                      out JP18 write protect
                               Ŀ         out JP34 termination
                                    U32                       power from
                                                              bus
                                                    out JP38 spin delay
                                        in  JP40 parity enable
   Ŀ                                   JP7    in  JP41 Termination
     U5      J J J                                           power from
             P P P                                            by drive
       1 2 3   Ŀ         JP6   
                        U22              
                                             ***Jumpers not listed
                                           are not user
                                                          configurable!!***
           Ŀ                                 
              U16           JP5                   
                            JP4                     SPIN UP SELECTION
                                              JP14 JP38
             J J J           Ŀ  Ŀ           out  out start by #
             P P P            U34    U44            out  in  start by cmd
             4 1 3                                  in   ??  stary by pwr
             0 4 8                      
                                                      SCSI ID SELCTION
                                       JP18           J2  J2  J2  SCSI ID
                                             JP41߳ #5  #4  #3
Ŀ                    JP34 
   J3      J2    J6 in  in  in   7
Ĵ                J1                  out in  in   6 default
               in  out in   5
           L III                                         out out in   4
           E DDD                                         in  in  out  3
           D 012                                         out in  out  2
                                                         in  out out  1
                                                         out out out  0



Revision A                                                    Sandoval/Anderson
10/07/93









