Head positioning system for positioning a multiple head with res

Details Head positioning system for positioning a multiple head with res Head positioning system for positioning a multiple head with res

1987-01-22

1990-02-20

Faber, Alan

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7701, 360121, 360 61, G11B 555, G11B 529, G11B 558

Patent

active

049031511

ABSTRACT:
A head positioning system on a recording medium includes a recording medium having a periodic arrangement of data tracks and servo tracks wherein the periodic arrangement having a predetermined period includes N.sub.d (N.sub.d is an integer equal to or larger than 1) number of data tracks and N.sub.s (N.sub.s is an integer equal to or larger than 2) number of servo tracks, the servo tracks having single phase servo patterns, alternatively recorded thereon, a multi-head carrying a plurality of head elements disposed in a direction perpendicular to the tracks, so that the distance between head elements is (N.sub.h +1/M)P where N.sub.h is an integer equal to or larger than O, M is an integer equal to or larger than 2, and P is a track pitch, wherein the multi-head is movable in a direction generally perpendicular to the direction of the tracks, means for selecting a servo head for reading servo tracks and a data head for reading data tracks from the head elements during a seek operation, wherein a selected servo head is selected to reproduce a servo pattern from a servo track and a selected data head is determined based on the selected servo head, and wherein the multi-head is positioned on a servo track in every 1/M track pitch of movement.

REFERENCES:
patent: 3263031 (1966-07-01), Welsh
patent: 3292168 (1966-12-01), Gray
patent: 3769465 (1973-10-01), Wellbrock
patent: 4149198 (1979-04-01), Behr et al.
patent: 4152736 (1979-05-01), Jansen et al.
IBM TDB vol. 15, No. 4, "Servo Control of Multielement Magnetic Heads", Zimmerman et al., Sept., 1972, pp. 1320-1321.
IBM TDB vol. 17, No. 4, "Multielement Servo Head", McCormick, Sept., 1974, pp. 979-980.

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