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

Micropolis 1518-15

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 1518-15 1341MB 5.25" FHT ESDI


Size 5-1/4"
Interface ESDI
Interface Type
Encoding Method RLL
Formatted Capacity 1341 MB
Disks 8
Heads 15
Cylinders 2104
Sectors 83
Buffer Size N/A
Average Seek 14.5 msec
Single Track 4 msec
Rotation Speed / Avg. Latency 3600 rpm +/- 0.5%
Transfer Rate to / from media 23.33 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 3.25"H
Weight 5.75 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up 2.0A (max)
Read / Write 4.25A avg 1.5A avg
Typical 24 Watts


Drive Addressing and Interface Termination
J12               J2                     J1                      J3
  ____   ________           ___________________   _   _________
|          |  |               |1|         |                                        |1|  |   |   POWER   |
|          |_|                  |____|                                           |_|   |_________|
|                                                                                                                 |
|                                    RN11              :  :  :   :  :   :   :  :                            |
|                                                           DDDWWWWW                W28: |
|                                                           AAA 5  4  3 2  1                          |
|                                                           3 21                                              |
|                                                                                                                 |
|                                                                                                                 |
|                                                                                                                 |
|                                     (Component Side)                                            |
|                                                                                                               _|
|                                                                                                              |
|                                                                                                              |_
|                                                                                                                 |
|                                                                                                                 |

Interface Terminator
 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

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 controllers'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 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

* 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.

When a 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.

* 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   Bytes/Sector
W4 W3  W2 Sectors
Per Track
Formatted  Unformatted
out out out 82 512 594
* out out in 83  512 584
out in out 44 1024 1105
out in in 22 2048 2209
in out out 11 4096 4419
in out in 58 768 839
in in out 149 256 326
in in in 1 48,608 48,608

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