Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1987-05-15
1990-01-16
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
G11B 509
Patent
active
048947342
ABSTRACT:
Method and apparatus for providing constant density recording is described. A single set of reconfigurable electronics is employed to control the write frequency for a plurality of frequency zones on a magnetic storage disk. The reconfigurable electronics include means for selectively switching a frequency response determining element within a common channel. Switching is controlled by a digital signal provided by a disk file control microprocessor, avoiding the necessity of mechanical linkages and/or changes in spindle rotation rate. The plurality of zones need not be of equal radius in width but the recording frequency within each zone is fixed throughout that zone. Zone selection is under the control of a disk file control microprocessor which produces a digital code to appropriately configure the electronics for the particular zone. Zone switching is done only when a seek across a zone boundary occurs so that no access time penalties result.
REFERENCES:
patent: 4314287 (1982-02-01), Freeman et al.
patent: 4432025 (1984-02-01), Grogan
patent: 4714967 (1987-12-01), Bizjak
Fischler Al
Wilson Ross
Canney Vincent P.
Maxtor Corporation
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