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

Micropolis 1654-6

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 1654-6 138MB 5.25" HHT ESDI


Size 5-1/4"
Interface ESDI
Encoding Method
Formatted Capacity 138.0 MB
Disks 4
Heads 6
Cylinders 1249
Sectors 36
Buffer Size N/A
Average Seek 16 msec
Single Track 4 msec
Rotation Speed / Avg. Latency 3600 rpm +/- 0.5%
Transfer Rate to / from media 10 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

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.

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 Control Option.
  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 installed for most PC/AT in applications.

W2, W3, W4 Sector Size 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 35 512 595
*out out in 36 512 578
out in out 19 1024 1096
out in in 9 2048 2314
in out out 5 4096 4166
in out in 32 512 651
in in out 64 256 325
in in in 1 20,832 20,832

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