Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1977-06-27
1978-09-19
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, G11B 2110, G11B 1700, G11B 582
Patent
active
041158237
ABSTRACT:
A data storage apparatus, such as an accessing head magnetic disk file, includes at least one data disk surface and a servo disk surface. In operation, a continuous position signal having high frequency components is derived from the servo surface, which has a quadature type servo signal prerecorded thereon. A circuit means modifies the derived position signal so that a substantially linear signal representing the displacement of the servo head from the servo track is obtained. A second position signal having a low frequency component is obtained from servo sector information registered on the data disk surface and together with the first position signal forms a hybrid position signal. This hybrid signal is used to control the movement of the data heads relative to the data tracks to ensure optimum transducing operation.
REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3742470 (1973-06-01), Ha et al.
patent: 3812533 (1974-05-01), Kimura et al.
patent: 3893180 (1975-01-01), Braun et al.
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4068269 (1978-01-01), Commander et al.
Commander Robert Duncan
Gardner Peter Alan Edward
Taylor John Richard
Eddleman Alfred H.
International Business Machines - Corporation
Kallman Nathan N.
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