Logical data tracks extending among a plurality of zones of phys

Details Logical data tracks extending among a plurality of zones of phys Logical data tracks extending among a plurality of zones of phys

1991-06-24

1993-04-13

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

G11B 509

Patent

active

052027996

ABSTRACT:
One or more data-storing disk devices support logical tracks extending between radial recording zones of tracks in the device(s). Each data-storing disk in the device(s) is formatted into a plurality of radial recording zones of physical tracks, each radial recording zone having a like number of physical tracks, each physical track may be one circumvolution of a single spiral track. The physical tracks in the respective recording zones store a different number of data bytes. Each logical track including a plurality of said physical tracks; at least one of the physical tracks in each of the logical tracks is in a different one of the radial recording zones in different ones of the devices or in a single device. Described are an extended logical track and extended logical cylinder accessing methods and apparatus. Not all of the physical tracks of any of the devices or recording zones need be a member of any logical track.

REFERENCES:
patent: 4016603 (1977-04-01), Otteson
patent: 4223909 (1980-09-01), Bowers et al.
patent: 4432025 (1984-02-01), Grogan
patent: 4680653 (1987-07-01), Ng et al.
Patterson et al "A Case for Redundant Arrays of Inexpensive Disks (RAID)", ACM 1988, Mar. 1988, pp. 109-116.

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