Micropolis hard Disk Drives, Specifications, Support, Specs, Jumpers, Manual, Images

Micropolis 1664-7

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 1664-7 344MB 5.25" HHT ESDI


Size 5-1/4"
Interface ESDI
Encoding Method RLL
Formatted Capacity 344.4 MB
Disks 4
Heads 7
Cylinders 1780
Sectors 54
Buffer Size N/A
Average Seek 14 msec
Single Track 4 msec
Rotation Speed / Avg. Latency 3600 rpm +/- 0.5%
Transfer Rate to / from media 15 Mbits / sec
Transfer Rate to / from buffer N/A
Tracks Per Inch (TPI)
Bits Per Inch (BPI)
Dimensions 8.0"L x 5.75"W x 1.625"H
Weight 5.75 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up 2.0A (max)
Read / Write .9A avg .7A avg
Typical 14 Watts


Drive Addressing and Interface Termination

RN1 Interface Terminator
  The Interface Terminator factory installed at RN1 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; 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. DA1, DA2, DA3 Drive Address Jumpers The
  drive address jumpers are identified as DA1, DA2 and DA3. Address
  selection is binary, as shown in the table below. The ESDI controller's
  documentation will specify the drive address to use.

Select Jumpers
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 the 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 Control Option.

W5 selects the spindle 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 installed for most PC/AT in applications.

W2, W3, W4 Sector Size and Number Options
  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.