                  MICROPOLIS 1528 DISK DRIVE
                        SPECIFICATIONS

                                       Model Number
Unformatted Capacity:                   1528-15 

  Total Mbytes            --------------  1535 -----------------     
  Disk Platters           ------------------ 8 -----------------     
  Read/Write Heads        ----------------- 15 -----------------      
  Cylinders               --------------- 2106 -----------------      
  Bytes per track         -------------- 48608 ----------------- 

Formatted Capacity  

  Total Mbytes            --------------- 1354 -----------------      
  Bytes per Sector        ---------------- 512 -----------------      
  Sectors per Track       ----------------  84 ----------------- 

PC Setup

  When using SCSI in a PC, the most common method is to run your    
setup program and define No Drives Present. The SCSI Host Adapter    
will automatically self-configure on power-up. To install the     
drive, follow the manufacturer's instructions to use the on-board     
BIOS routine or software that was supplied with the Host Adapter.   

Performance Specifications  

  Seek Time                       Track-to-Track           4 msec
    (including settling time)     Average               14.5 msec
                                  Maximum                 33 msec

  Average Rotational Latency                            8.33 msec
  Rotational Speed                              3600 rpm +/- 0.5%

  Data Transfer Rate at Interface  
     Synchronous                                   4.8 Mbytes/sec
     Asynchronous                                  1.6 Mbytes/sec

  Internal Data Rate                              23.33 Mbits/sec

  MTBF                                              150,000 hours
  Positioner                     Fully balanced rotary voice coil
  Parking                                 Automatic park and lock

 General Functional Specifications  

  Interface                                                SCSI-2

  Supports Common Command Set                                 YES
  SCSI-2                                                      YES
  Write Precompensation Start Cylinder                       2100
  Reduced Write Current Start Cylinder                       2100
  Landing Zone                                               2100
  Mounting Plane                                  Any orientation

Power Requirements  

  +12V +/-5%                                            2.0 A Avg
                                      (4.35A max during start-up)
  +5V +/-5%                                              2.0A avg
 
  Power dissipation, typical                             24 Watts
 
 
7. Drive Addressing and Interface Termination
 
 
              _ID2  
             |  _ID1  
             | |  _ID0  
             | | |                        Pin 1  
         J2  | | |              J1            |       J3   
      ___________    __________________________     ________  
    _|           |  |                          |   |        |  
   | |___________|_ |__________________________|___|________|  
   |  ..  ..                                                |  
   |  W5  W4          RN9         W2                        |  
   |                              W1                 W11    |  
   |                                                        |  
   |                                                    W28 |  
   |                                                        |  
   |                                                        |  
   |                                                        |  
   |                                                        |  
   |                                                        |  
   |                                 Component Side         |  
   |                                                        |  
 
 
ID0, ID1, ID2 SCSI Address Jumpers  
  The SCSI ID (drive address) jumpers are identified as ID0, ID1, 
  and ID2. ID selection is binary, as shown in the table below.  
 
   SCSI              Jumpers  
  Address        ID2   ID1   ID0  
  -------        ---   ---   ---  
     0           out   out   out  
     1           out   out    in  
     2           out    in   out  
     3           out    in    in  
     4            in   out   out  
     5            in   out    in  
     6            in    in   out  
     7            in    in    in  
  
  For multiple drive installations, on one Host Adapter, each drive 
  must have a unique address. Drives are configured as SCSI ID 7 
  at the factory.  
 
RN9 Interface Terminator  
  The Interface Terminator factory installed at RN9 provides     
  proper termination for the interface lines. When daisy-chaining  
  multiple drives, leave the terminator installed only in the last 
  physical drive (or drives) on the daisy chain cable; remove the 
  terminator from each of the other drives (or the host computer). 
 
W1, W2, Terminator Option  
  W1 and W2 select the source of terminator power (+5V) for the   
  interface terminator. If a jumper is installed at W1(the factory 
  default configuration), and no jumper is installed at W2 the   
  drive provides terminator power. This configuration is used     
  for PC/AT applications. If a jumper is on W2 the host adapter   
  will supply terminator power. If a jumper is installed at W2 and  
  W11, and no jumper is installed at W1 the drive provides        
  terminator power to it's on-board terminators and also to the
  SCSI bus via interface connector J1, pin 26.
  
W11 Bus Option  
  W11 allows the drive to supply interface terminator power to the
  SCSI Bus. If W11 is not installed and W1 is jumpered (the factory
  default configuration), the drive does supply SCSI bus interface
  terminator power. W11 should not be installed for PC/AT
  applications.
 
W5 Spindle Option  
  Selects the spindle control option. If W5 is jumpered, the
  drive must wait for a Start Spindle command (after power is
  applied) to start the spindle motor. If W5 is not installed
  (the factory default configuration), the drive automatically
  starts the spindle motor at power-on. W5 is not installed for
  PC/AT installations.
 
W4 Bus Parity Option  
  W4 selects the parity check option. If W4 is installed, the drive 
  neither generates nor detects parity. If W4 is not installed (the 
  factory default configuration), the drive generates parity and
  enables parity detection. W4 is usually not installed for PC/AT
  applications. Verify the correct configuration required by your
  Host Adapter.  
 
W28 Ground Options  
  W28(only implemented on Rev B and later boards) is used to
  connect the drive's logic ground to frame ground. When at jumper
  is installed at W28, frame ground is connected to logic ground.

  When a jumper is not installed at W28 (the factory default
  configuration), frame ground is not connected to logic ground.
  For PC/AT applications, is a jumper should be installed at W28.

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