Tri-phase servo pattern for providing information for positionin

Details Tri-phase servo pattern for providing information for positionin Tri-phase servo pattern for providing information for positionin

1986-11-19

1989-03-07

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, G11B 5596

Patent

active

048111350

ABSTRACT:
Servo data, including three types of servo patterns distinguishable by phase, are stored in concentric servo tracks on a magnetic information storage disk. Each servo track includes a plurality of only one type of pattern, with consecutive tracks arranged in a repeating sequence of the three 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 but one type of pattern. The servo patterns in a given storage track thus are always angularly offset from the servo patterns in the next adjacent tracks. This permits the use of servo patterns having a radial dimension greater than the separation between adjacent tracks, 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 Callibration 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 Serving, J. D. 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 . . . , K. H. Schaller, pp. 1792-1794.

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