Method for writing servo patterns to a disc of a hard disc drive

Details Method for writing servo patterns to a disc of a hard disc drive Method for writing servo patterns to a disc of a hard disc drive

1991-08-29

1992-11-17

Dixon, Joseph L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Selective erase recording

G11B 5024

Patent

active

051648636

ABSTRACT:
A method of writing servo patterns to the surface of a disc of a hard disc drive without magnetizing the transducer head by means of which the patterns are written. The surface is initially magnetized in one direction through the transducer head while the disc is rotating to move the disc surface by the transducer head. Each servo pattern is subsequently written by passing a current through the transducer in the opposite direction for selected time interval. Following writing of each pattern, a current is passed through the transducer head in the direction used to initially magnetize the disc for a time interval equal to the time interval during which the pattern was written.

REFERENCES:
patent: 4414589 (1983-11-01), Oliver et al.
patent: 4511938 (1985-04-01), Betts
patent: 4602304 (1986-07-01), Fultz
IBM Technical Disclosure Bulletin, A. J. Betts, Null Servo Pattern, vol. 18, No. 8, Jan. 1976, pp. 2656-2657.
IBM Technical Disclosure Bulletin, R. K. Oswald, Track Following Servo Systems, vol. 18, No. 10, Mar. 1976, pp. 3424-3425.
IBM Technical Disclosure Bulletin, K. H. Schaller, Phase and Location Coded Servo Pattern for Controlling . . . , vol. 20, No. 5, Oct. 1977, pp. 1792-1794.

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