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Hardware Disk Drives¶

ND 592 14 MBytes 8” Fixed Winchester Disk¶

ND 593 22 MBytes 8” Fixed Winchester Disk¶

Introduction¶

The ND 592/593 Eight-Inch Fixed Disk Drives are random access storage devices, using fixed sealed modules as the storage medium. They are designed for high performance and reliability and require no preventive maintenance.

ND 592/593 may be mounted vertically or horizontally in the same space as an eight-inch flexible disk drive. The digital interface is intended to be attached to a single controller capable of controlling both this disk drive as well as a flexible drive.

Features¶

Full data recovery circuitry
Sealed disk, head and actuator chamber
No preventive maintenance required
LSI circuitry
Low noise for office use
Vertical or horizontal mounting
Less than 350 BTU power dissipation
Rotary voice coil actuator

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[Scanned photo of a disk drive unit]

592/593–A1–6000–1082

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Product Description¶

ND 592/593 has two disks located in an environmentally sealed chamber; no unfiltered outside air is drawn into the unit. Air is recirculated within the disk/actuator chamber and passes through a filter to ensure a contamination-free environment. A rotary voice coil actuator provides rapid access and positioning accuracy.

The use of large scale integrated (LSI) circuitry and microprocessor control means that only three circuit boards are used. Phase-locked oscillator data recovery and reference clocking increases data integrity.

ND 592/593 can be configured with up to four drives in a star or daisy-chain configuration. The interface also allows the ND 592/593 to be placed in a daisy-chain configuration with flexible disk drives.

Recording Mode¶

Interface	NRZ
Disks	MFM
Data transfer rate	6.45 Mb/s (806 KB/s)
Rotational speed	3600 r/min
Average latency	8.33 ms
Single track seek time	10 ms maximum
Average seek time	50 ms
Maximum seek time	1100 ms

Data Reliability¶

Recoverable Read Errors	Less than 1 in 10^10 bits transferred
Unrecoverable Read Errors	Less than 1 in 10^12 bits transferred
Seek Errors	Less than 1 in 10^6 seek operations
MTBF	10,000 hours minimum
Service life	5 years or 30,000 hours

Technical Specifications¶

Total surfaces	4 (3 data surfaces, 1 servo surface)
Capacity per track	13,440 bytes
Track density	554 Tracks/inch
Tracks per surface	605

Power	+ 5V DC (± 2%), 1.1A
	- 5.2V DC (± 2%), 2.0A
	+ 24V DC (± 10%), 2.8A (4.5A peak)
Power dissipation	Less than 102.55 W
Operating Temperature	+ 10°C – + 40°C
Operating Humidity	20% to 80%

Height	106 mm
Width	218 mm
Depth	362 mm
Weight	9.53 kg

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  |     [Logo: Norsk]  |
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  |     [Logo: Comtec]  |
  |  DIVISION OF NORSK  |
  |        DATA         |
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Note: NORSK DATA reserves the right to change specifications without notice.