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

Micropolis 1991 Scorpio 9

Hard Disk Drive


Model Capacity Size Height Interface Bus Type
Micropolis 1991 Scorpio 9 9091MB 5.25" FHT W SCSI2



Micropolis 1991 disk drives provide 9 gigabytes of formatted capacity for applications that require high- performance data storage.

  • Largest capacity 5.25-inch drive available
  • Industry-standard Fast and Fast/Wide SCSI-2 interfaces
  • 512 KByte buffer with multi-segmented cache for faster read/write operations
  • 5400-rpm spindle motor speed with 5.56 ms average latency
  • Spindle synchronization supported for multiple-drive applications
  • Multiple Zone Recording (MZR) technology provides faster data rate
  • High data integrity with automatic retries, parity checking, and on-the-fly error detection and correction using 126-bit Reed-Solomon code
  • 31 Watt typical power dissipation
  • Hybrid servo provides superior on-track and seek performance
  • Active termination supported
  • Awarded "SPARC Verified" status from SPARC International, Inc., by completing their Peripheral Verification Testing. Click on the "thumbnail" to see the certificate full size (145k).
  • Five-Year Warranty through Micropolis Authorized Distributors


Size 5-1/4"
Interface SCSI-2F
Encoding Method
Formatted Capacity 9.091 MB
Cylinders 4446
Sectors Variable
Buffer Size N/A
Average Seek 12 msec
Single Track
Rotation Speed / Avg. Latency 5400 rpm +/- 0.5%
Transfer Rate to / from media 10 Mbytes / sec Synchronous
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 4.0kg / 8.81 lbs.

Power Requirements

+12V +/-5% +5V +/-5% Power
Spin up 2.2A
Read / Write 4.8A 1.0A
Typical 33 Watts


Drive Addressing and Interface Termination

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.

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.

RN4 & RN5 Interface Terminators
  The Interface Terminator factory installed at RN6 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).

Bus Termination Power Option
  A jumper is installed at W6, at W8, or at W5 to select the source of terminator
  power (+5V) for the SCSI Bus terminator packs on the device electronics board.

  When a jumper is installed at W6 (the factory default configuration), the drive
  provides terminator power to it's on-board terminators.

  When a jumper is installed at W8 , terminator power is is provided by the host
  system via the interface cable J1, pin 26 (TERMPWR).

  When a jumper is installed at both W8 and W5, the drive provides terminator
  power to its on-board terminators and also to the SCSI bus via interface cable J1,
  pin 26(TERMPWR).

Frame Ground Options
  Jumper W9 selects the frame ground option.

  When W9 is installed, the drive's frame is connected to frame ground.

  When a jumper is not installed at W9 (the factory default configuration),
  frame ground is not connected to logic ground.

Spindle Control Options
  A jumper bridging pins 7 and 8 of J2 (the 4th set of pins) is used to select the
  spindle control option.

  When a jumper is installed, the drive must wait for an interface Start Unit
  command to start the spindle motor.

  When a jumper is not installed (the factory default configuration), the drive
  automatically starts the spindle motor at power-on.

SCSI-1/2 Select
  A jumper at WP selects SCSI-1 or SCSI-2. If the jumper is installed
  (the factory default configuration), the drive is configured as a SCSI-2 device.
  the drive is not write protected.

Bus Parity Option
  A jumper bridging pins 13 and 14 of J2(7th set of pins) is used to select the
  parity check option.

  When a jumper is not installed, (the factory default configuration), the drive
  generates parity and enables parity detection.

  When a jumper is installed, the drive neither generates nor detects parity.

Spindle Synchronization Option
  The Rotational Position Locking field (MODE SELECT command, Page Code 04h)
  is used to specify spindle synchronization operation; see document #110366
  (Scsi Implementation in Micropolis "MZR" Products) and ANSI SCSI Standard.

  Unsynchronized: If the drive is est to Unsynchronized (PRL=00b), it ignores the
  SLAVE SYNC signal.

  Slave: If the drive is set to Slave (RPL=01b), it does not generate the MASTER SYNC
  signal or the SLAVE SYNC signal but synchronizes its index to the SLAVE SYNC
  signal (J2,pin 20) supplied by an external source.

  Master: If the drive is set to MASTER (RPL=10b), it generates the SLAVE SYNC
  output signal (j2, pin 20) for use directly by the slave drives.

  Master Control: If the drive is set to Master Control (RPL=11b), it generates the
  MASTER SYNC signal(j2,pin 20). This output is used by the controller to generate
  the SLAVE SYNC signal(J2,pin 20) for the slave drives.

Also refer to the notes on installation in HP workstations or in workstations from Sun Microsystems.


Notes on OEM use

Micropolis model 1991 was also sold OEM as DEC RZ58 (part no. VS0050-01-8) and RZ58-E with all labeling and marking white-labeled for digital equipment corp.
DEC RZ58, an OEM Micropolis 1991 HDD