Method for writing a servo pattern

Details Method for writing a servo pattern Method for writing a servo pattern

1988-12-14

1990-03-27

Stephan, Steven L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 31, 360 7708, 360 75, G11B 555, G11B 558

Patent

active

049125761

ABSTRACT:
Servo data, distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of one type of servo pattern, with consecutive tracks arranged in a repeating sequence of the servo pattern types. For phase recognition, the pattern types further are arranged in a repeating sequence of angular sectors, each sector having a plurality of servo patterns. The servo patterns in a given storage track thus are always angularly offset from the servo patterns in the tracks adjacent thereto, permitting the use of servo patterns radially dimensioned to be greater than the separation distance between adjacent tracks, thereby increasing servo signal reliability and transducer dynamic range.

REFERENCES:
patent: 4087843 (1978-05-01), Louis et al.
patent: 4511938 (1985-04-01), Betts
IBM-TDB, vol. 18, No. 10, Mar. 1976, Track Following Servo System, R. K. Oswald, pp. 3424-3425.
IBM-TDB, vol. 20, No. 1, Jun. 1977, Off-Track Gain Calibration of a Position Error Signal, R. S. Palmer, pp. 349-350.
IBM-TDB vol. 20, No. 5, Oct. 1977, Rotating Record Disk Initialization for Sector Servoing, J. C. Dennison et al., pp. 1789-1791.
IBM-TDB, vol. 20, No. 5, Oct. 1977, Phase and Location Coded Servo Pattern for Controlling the Magnetic Head in Track . . . , H. K. Schaller, pp. 1792-1794.

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