System for detecting the position of a read-write head on a disk

Details System for detecting the position of a read-write head on a disk System for detecting the position of a read-write head on a disk

1984-03-05

1986-12-23

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 360135, G11B 2108, G11B 2110

Patent

active

046316060

ABSTRACT:
In order to perform a high-speed seek of a target track while the increase of area of servo sectors is minimized, each servo sector of a disk recording medium has K (an integer of 3 or more) servo patterns. The K servo patterns consist of a first servo pattern consisting of two-phase first and second pairs of alternate pattern arrays having a period of four tracks; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2.sup.K+1 tracks and displaced by 2.sup.K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2.sup.K-k+3 (k includes all integers of not less than 3 and not more than K) tracks and displaced by 2.sup.K-k+1 tracks with respect to a (k-1)th servo pattern. K is set to 3 for a head speed of 16 tracks/sector. In this case, three servo patterns consisting of seven pattern arrays are provided. Similarly, K is set to 4 for a head speed of 32 tracks/sector. In this case, four servo patterns consisting of eight pattern arrays are provided. With such a configuration of servo patterns, the number of signal detectors for detecting servo signals corresponding to the servo pattern arrays, which are provided in a servo tracking apparatus, can be minimized.

REFERENCES:
patent: 4027338 (1977-05-01), Kril
patent: 4163265 (1979-07-01), van Herk et al.
patent: 4238809 (1980-12-01), Fujiki
patent: 4390912 (1983-06-01), Hertrich et al.
patent: 4400747 (1983-08-01), Siverling
patent: 4464689 (1984-08-01), Propst
patent: 4499511 (1985-02-01), Sugaya
IBM TDB vol. 20, No. 8, "Sector Servo Method" Deremer et al., Jan. 1978, pp. 3243-3247.
IBM TDB vol. 18, No. 10 "Track Following Servo System" Oswald, Mar. 1976, pp. 3424-3425.
IBM TDB vol. 22, No. 12, "Quad Burst Servo Pattern" Liu, May 1980, pp. 5436-5438.

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