Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1981-06-04
1983-12-27
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
360 78, 360 97, 360 98, G11B 554, G11B 2108
Patent
active
044234481
ABSTRACT:
An improved disk file is disclosed including multiple independent transducer/actuator arrays disposed about a common disk (stack) and adapted to afford a plurality of alternate "Data-paths" whereby (virtually any) track on any disk may be accessed for data-in/data-out using a selectible one of several "data paths".
In one type embodiment, this is implemented by switching-over between electronic-control stages when one such stage fails.
In another type embodiment, it is afforded by providing overlapping track coverage by multiple head-units. Here, for any given (pair of) disk faces, each of several actuator arrays is assigned a respective set of tracks to cover as its "primary responsibility", also being assigned another adjacent set of tracks as its "secondary" (back-up) responsibility.
Such arrangements can provide such benefits as "multiple paths to data", and can convert "Hard" failure to "Soft" failure.
REFERENCES:
patent: 3774172 (1973-11-01), Silverman
patent: 4016547 (1977-04-01), Page
patent: 4270154 (1981-05-01), Crawford
Burroughs Corporation
Cass Nathan
Eddleman Alfred H.
McCormack John J.
Peterson Kevin R.
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