Self-timed runout correction pattern

Details Self-timed runout correction pattern Self-timed runout correction pattern

1984-06-06

1985-07-16

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360135, G11B 558, G11B 2110, G11B 2336

Patent

active

045300208

ABSTRACT:
A runout correction pattern is recorded on the peripheral track of the disk during the initial recording of the data stored thereon. The runout correction pattern comprises an integer number of sequentially recorded groups, each comprised of an increment of full track erasure, a like increment of high transition density automatic gain control information, a first burst of servo control information, and a second burst of servo control information. Previously necessary clock tracks are not incorporated. The bursts of servo control information are recorded "off-track" by one-half of the center line to center line spacing between adjacent tracks so that all first bursts are to one side of the center line of the track and all second bursts are to the opposite side of the center line of the track. Decoding of the runout correction patterns by a positionally fixed playback transducer establishes runout correction information which may be provided to control, as a function of rotational angle of the disk, the servo mechanism adjusting the playback transducer position during playback of the data stored on the disk.

REFERENCES:
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4149199 (1979-04-01), Chick et al.
patent: 4157577 (1979-06-01), Porter, Jr. et al.
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4286296 (1981-08-01), Cunningham
patent: 4371960 (1983-02-01), Kroiss

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