Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1991-09-04
1994-04-26
Dzierzynski, Paul M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7708, G11B 2108
Patent
active
053072162
ABSTRACT:
A method and apparatus are provided for digitally correcting sector pulse placement in a direct access storage device. A sector clock signal is generated equal to a sub-multiple clock rate of a predetermined servo identification clock. An individual servo identification field location is identified and compared with an expected location of said individual servo identification field to identify an error value. The sector clock signal is modified by adding or subtracting clock pulses responsive to the identified error value for generating a sector pulse.
REFERENCES:
patent: 4133011 (1979-01-01), Kurzweil, Jr.
patent: 4297734 (1981-10-01), Laishley et al.
patent: 4297737 (1981-10-01), Andresen et al.
patent: 4488189 (1984-12-01), Axmear et al.
patent: 4575776 (1986-03-01), Stephens et al.
patent: 4639863 (1987-01-01), Harrison et al.
patent: 4860194 (1989-08-01), Harrison et al.
patent: 4872074 (1989-10-01), Brown et al.
patent: 4879612 (1989-11-01), Freeze et al.
patent: 4884152 (1989-11-01), Ide
patent: 4920462 (1990-04-01), Couse et al.
patent: 4949202 (1990-08-01), Kim
patent: 4956727 (1990-09-01), Bezinque et al.
patent: 4977472 (1990-12-01), Volz et al.
patent: 4984100 (1991-01-01), Takayama et al.
IBM Technical Disclosure Bulletin, vol. 19, No. 11, Apr. 1977, pp. 4349-4351, "Sector Pulse Check Circuit", Dawson et al.
IBM Technical Disclosure Bulletin, vol. 30, No. 11, Apr. 1988, pp. 252-253, "Soft Sector Disk File System", Elliott et al.
IBM Technical Disclosure Bulletin, vol. 32, No. 5B, Oct. 1989, pp. 322-324, "Phase Error Detect Logic for Disk File Speed Control", Elliott et al.
IBM Technical Disclosure Bulletin, vol. 32, No. 6A, Nov. 1989, pp. 275-276, "Digital Encoding Scheme with Error Detection", Conway et al.
Cook Wesley A.
Reno Daniel D.
Billion Richard E.
Dzierzynski Paul M.
Forrest Bradley A.
Hanig Richard
International Business Machines - Corporation
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