                   MICROPOLIS 1568 DISK DRIVE
                        SPECIFICATIONS

Unformatted Capacity:

                              Model Number

                                   1568-15

  Total Mbytes      ------------------ 765 ----------------------
  Disk Platters     -------------------- 8 ----------------------
  Read/Write Heads  ------------------- 15 ----------------------
  Cylinders         ----------------- 1632 ----------------------
  Bytes per track   ---------------- 31250 ----------------------

Formatted Capacity (typical)

  Total Mbytes      ------------------ 676 ----------------------
  Bytes per Sector  ------------------ 512 ----------------------
  Sectors per Track ------------------- 54 ----------------------

PC Drive Types

  If you are using third-party installation software or an on-   
  board BIOS on the controller, follow the instructions included
  with the software or controller. Otherwise, examine the entries
  in your system drive table and find the type that most resembles
  the head and cylinder parameters of the drive without exceeding
  these parameters.

Performance Specifications

  Seek Time (including settling time)     Track-to-Track   4 msec
                                          Average         16 msec
                                          Maximum         35 msec
  Average Rotational Latency                            8.33 msec
  Rotational Speed                              3600 rpm +/- 0.5%
  Data Transfer Rate                                 15 Mbits/sec
  MTBF                                              150,000 hours
  Positioner                     Fully balanced rotary voice coil
  Parking                                 Automatic park and lock

General Functional Specifications

  Interface                                                  ESDI
  Sectoring (see W1 description, below)              Hard or Soft
  Write Precompensation Start Cylinder                      1632*
  Reduced Write Current Start Cylinder                      1632*
  Landing Zone                                               1632
  Mounting Plane                                  Any orientation

  * These  are effectively turned off by specifying a non-existent
  cylinder. Some systems accomplish this by using a value of "-1"

Power Requirements

  +12V +/-5%                                            2.0A avg.
                                      (4.3A  max during start-up)
  +5V +/-5%                                             1.5A avg.
  Heat dissipation, typical                              29 Watts


1560-series drives require the use of an ESDI Controller capable
of a data transfer rate of at least 15 Mbits/sec.

Drive Addressing and Interface Termination

   NOT
   USED
   J12       J2                J1                  J3
   ____   ________      ___________________   _ _________
  |    | |      |1|    |                 |1| | |  POWER  |
  |    |_|        |____|                   |_| |_________|
  |                                                      |
  |                   RN11          ::::::::             |
  |                                 DDDWWWWW             |
  |                                 AAA54321             |
  |                                 321                  |
  |                                                      |
  |                                                      |
  |                                                      |
  |              (Component Side)                        |
  |                                                     _|
  |                                                    |
  |                                                    |_
  |                                                      |
  |                                                      |

The Interface Terminator factory installed at RN11 will provide
proper termination for the interface lines. When daisy-chaining
multiple drives, leave the terminator installed  only in the last
physical drive on the daisy chain cable; remove the terminator from
each of the other drives. In most PC/AT installations, the C: drive
is actually at the end of the cable and should retain the
terminator.

The drive address jumpers are identified as DA1,DA2 and DA3.
Address selection is binary, as shown in the table below. The ESDI
controllers's documentation will specify the drive address to use.

   Drive            Select Jumpers
  Address        DA3     DA2     DA1
  -------        ---     ---     ---
     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

"Drive address 0" (no jumper at DA1,DA2, or DA3) is a "deselect"
(i.e., no drive selected).

Drives are factory configured as Drive Address 1.

For many multiple drive installations,each drive must have a unique
address. An exception is that for every drive in a PC/AT
installation, verify that only Drive Address is at DA2; move the
jumper if necessary (the special twisted interface cable that is
generally used takes care  of assigning a unique address to each
drive). PC/AT controller can typically support a maximum of two
drives.

* W5 selects the spindle a control option. If W5 is installed, The
drive waits 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 applications.

* W1 selects  the sectoring mode. If W1 is installed , the drive
operates in the soft-sectored mode.

If W1 is not installed(the factory default configuration), the
Drive operates in the hard-sector mode. W1 is not install for most
PC/AT in applications.

W28 is for the Frame ground option.

* The number of bytes per sector may be specified using the Set
Bytes Per Sector command or by selecting a default sector
configuration with jumpers W2, W3, and W4 as follows:

       Jumpers            Sectors            Bytes/Sector
    W4    W3    W2       Per Track       Formatted  Unformatted
    ---   ---   ---      ---------       ---------  -----------
    out   out   out         53              512          588
 -------------------------------------------------------------
| * out   out    in         54              512          576  |
 -------------------------------------------------------------
    out    in   out         28             1024         1116
    out    in    in         14             2048         2232
     in   out   out          7             4096         4464
     in   out    in                     (Reserved)          
     in    in   out         97              256          321
     in    in    in          1           31,248       31,248

 * This is the default (factory installed) configuration and is
recommended for PC/AT applications


