Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1976-07-19
1978-02-07
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, 360 98, G11B 556, G11B 2110, G11B 1700
Patent
active
040729907
ABSTRACT:
Data track positioning information for data tracks on a stack of recording disks is provided by servo information pre-recorded on one surface of the stack. In addition, each data track on the remaining surfaces of the stack has servo information relative to that track pre-recorded in sectors around the track. Track following operations are controlled in a closed loop servo system using on-track position information derived from the sectored servo tracks associated with the track being followed. The bandwidth of the position error signal derived from the sectored servo information is increased by adding high frequency components obtained from the continuous servo information on the servo surface. Track access operations are controlled using track crossing information derived from the pre-recorded servo information on the servo surface.
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patent: 3994016 (1976-11-01), Moghadam
IBM Technical Disclosure Bulletin, vol, 10, No. 6, Disc Surface Digital Addressing, C. R. Wilford et al., Nov. 1967, p. 783.
IBM Tech. Disc. Bull., vol. 16, No. 7, Track Servo System, L. F. Shew, Dec. 1973, pp. 2225-2226.
IBM Tech. Disc. Bull., vol. 15, No. 3, Discrete Magnetic Recording System, L. F. Shew, Aug. 1972, pp. 752-753.
IBM Tech. Disc. Bull., vol. 17, No. 6, Correction of Data Track Misregistration in Servo Controled Disc. Files, A. Paton, Nov. 1974, pp. 1781-1783.
Case William J. P.
Commander Robert D.
Cummins R. E.
Eddleman Alfred H.
International Business Machines - Corporation
Moss R. D.
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