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ND 574 288 MByte Disk Drive¶
ND 558 ECC Disk Controller¶
Introduction¶
The ND 574 — 288 Mbyte Disk Drive — is a high performance high capacity random access storage device using a removable disk pack for recording of data. Each pack contains eleven recording disks. Data is stored on 19 surfaces. One surface is used for servo head positioning.
Features¶
- Low average access time
- High data transfer rate
- Daisy chaining of up to 4 drives on one ND 558 — Disk Controller
- Easy loading and unloading of disk packs
- Automatic retries whenever recording errors are encountered
- ECC as standard for increased reliability
- Media and interface compatibility with other manufacturers
- Standard quiet cabinet
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Product Description¶
The basic disk unit consists of a disk pack spindle with associated drive motor, an actuator assembly, speed and position sensing devices, and logic circuitry for positioning, reading, and writing.
A hinged cover allows access to the spindle for pack installation and removal, while also providing a seal in the closed position to maintain cleanliness within the disk shroud.
The disk controller — ND 558 — takes care of the data transfers between one of maximum 4 disk drives and memory. A 64 word FIFO buffer is employed to allow instantaneous DMA traffic to be larger than maximum channel bandwidth, by buffering disk data to and from memory.
ECC is standard for ND 558 and is capable of 34 bit burst error detection and 11 bit burst correction within each sector (512 words).
Number of tracks/cylinder¶
- 19
Net capacities per:¶
| Sector | 512 words |
|---|---|
| Track | 9216 words |
| Cylinder | 175104 words |
| Unit ND 574 | 144.110592 Mwords (288 Mbytes) |
Transfer rate:¶
| Bit rates | 9.677 mHz |
|---|---|
| Word rates | 604 kHz |
Maximum number of units/controller ND 558¶
- 4
Media:¶
- 288 Mbyte Diskpack: ND 575
Power requirements:¶
| Voltage AC | 220V + 15, -25 240V + 17, -27 |
|---|---|
| Watts | 1300 operating, 500 stand-by |
| Hertz | 50 + 0.5, -1.0 |
Temperature:¶
| Operating | 15.5°C to 32°C |
|---|---|
| Gradient | 6.6°C/hour |
Humidity:¶
- Operating: 20% to 80% non-condensing
Size:¶
| Height | 91.4 cm |
|---|---|
| Width | 58.4 cm |
| Depth | 91.4 cm |
| Weight | 321 kg |
Specifications¶
| Positioning time | 55 ms maximum, 30 ms average, 6 ms one track |
|---|---|
| Latency time | 17.2 ms maximum, 8.33 ms average |
| Access time (positioning and latency time) | 72.2 ms maximum, 38.33 ms average |
| Number of cylinders | 823 |
| Number of sectors/track | 18 |
Contact Information¶
Norsk Data A.S
Lindebergvn. nord 20, Box 4 - Lindeberg gård
Oslo 10, NORWAY
Tel. 02-391601, Tlx. 18661 nd n
ND Norsk Data AB
Kanalvägen 3, Box 2031
194 02 Upplands Väsby, SWEDEN
Tel. 0760-86500, Tlx. 13528 nordata s
ND Norsk Data AB
Klangfärgsgatan 11, Box 9052
421 09 Västra Frölunda, SWEDEN
Tel. 031-299350
Norsk Data ApS
Øverødvej 5
2840 Holte, DENMARK
Tel. 02-425055
Norsk Data France
"Le Brevent", Avenue du Jura
01210 Ferney-Voltaire, FRANCE
Tel. 050-408765, Tlx. 385653 nordata fernv
Norsk Data N.A., Inc.
65, William Street
Wellesley, Mass. 02181, USA
Tel. 0617-237.7945, Tlx. 921740 norsk well
Norsk Data France
120 Bureaux de la Colline
92213 Saint Cloud Cedex, FRANCE
Tel. 01-6023367, Tlx. 201108 nd paris
Richard Norton (NORD) Ltd.
NORD House, 17 Balfe Street, King's Cross
London N1 9EE, ENGLAND
Tel. 01-2785501, Tlx. 299537 norton g
Norsk Data Deutschland GmbH
Abraham-Lincoln-Str. 30
6200 Wiesbaden, WEST GERMANY
Tel. 06121-764220, Tlx. 4186370 noda d