Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Patent
1991-01-15
1993-10-26
Dixon, Joseph L.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
360 40, 360 51, 360 721, G11B 509
Patent
active
052571432
ABSTRACT:
A zone-bit-recording disk drive has a rotating platter with a surface which is divided into at least two zones each having a respective different number of angularly spaced sectors therein. A method and apparatus for positioning the head relative to the platter surface involve maintaining a count of the number of sectors which pass the head after the platter passes a predetermined angular orientation, ignoring the count during a time interval when the head moves out of a first of the zones toward a second of the zones which contains the specified sector and until the head has entered the second zone and the platter thereafter passes a predetermined angular orientation, and thereafter determining when the count corresponds to the specified sector to be accessed.
REFERENCES:
patent: 4016603 (1977-04-01), Ottesen
patent: 4200928 (1980-04-01), Allan et al.
patent: 4647991 (1987-03-01), Zangenehpour
patent: 4758944 (1988-07-01), Bartley et al.
patent: 4999720 (1991-03-01), Wilson et al.
patent: 5050013 (1991-09-01), Holsinger
Dixon Joseph L.
Robertson David L.
Zenith Data Systems Corporation
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