Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1991-06-21
1994-01-11
Pascal, Robert J.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 48, 360 40, 360135, 369 32, G11B 509
Patent
active
052787036
ABSTRACT:
A data processing system records information on magnetic disks in a format in which sector headers, which include embedded servo information, are radially aligned and recorded at a single frequency and data are recorded at various band-related frequencies. The system records sector headers at a frequency which is optimal for the recording of address information in the shortest sector and records the data at frequencies which are optimal for the recording of information in the disk space allocated to the data portion of the various lengths of sectors. The system synchronizes to the headers, using conventional embedded servo synchronization methods, and produces header timing signals. It can then use the same header timing signals to locate and interpret the headers on different tracks, since the header frequency and the location of the headers are the same in every track. The system may record the data portions of the sectors at frequencies which are related to the header frequency by ratios of small integers. The system then uses, in synchronizing to the disk, a phase locked loop which includes a voltage controlled oscillator (VCO) that is driven to a reference frequency which is directly related to the header frequency. The system divides-down the frequency of the VCO output signal to produce the timing signals for the header. Also, it uses a version of the output signal of the VCO, which is divided-down by a band-related value, as a timing signal for the data.
REFERENCES:
patent: 4016603 (1977-04-01), Ottesen
patent: 4198677 (1980-04-01), Ashinuma et al.
patent: 4714967 (1987-12-01), Bizjak
patent: 4858034 (1989-08-01), Hassel et al.
patent: 5121280 (1992-06-01), King
DeRoo John E.
Frame Robert
Rub Bernardo
Skraly Samuel B.
Solli Anne
Digital Equipment Corp.
Neyzari Ali
Pascal Robert J.
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