Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-10-30
1991-03-26
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, 360 7707, 360 7712, 369 43, G11B 558, G11B 2102
Patent
active
050034120
ABSTRACT:
The present invention describes a time based servo pattern scheme which provides position and velocity information with high accuracy. A plurality of servo lines are formed on a data disk extending from the inner track to the outer track, In the preferred embodiment of the present invention, these lines are employed as part of a buried servo scheme such that the entire useable disk surface is dedicated to data storage. The servo pattern is written on each side of the disk so that, if the disk were transparent, the respective servo lines would appear to intersect when viewed from above. Servo heads located on each side of the disk detect servo line crossings. By comparing the time difference between crossings of corresponding tracks on either side of the disk, the radial position of the heads can be determined. Therefore, even when nominal track centers do not fall on servo line intersections, their position can be determined accurately. Thus, the servo pattern of the present invention is track pitch independent. A concentric calibration track is formed on the disk surface so that offsets between the desired servo and data head positions may be detected and compensated.
REFERENCES:
patent: 3175205 (1965-03-01), Auyang
patent: 3212074 (1965-10-01), Daniels et al.
patent: 3426337 (1969-02-01), Black et al.
patent: 4371960 (1983-02-01), Kroiss
patent: 4587579 (1986-05-01), Cocke et al.
patent: 4700244 (1987-10-01), Fasen et al.
IBM TDB vol. 23, No 2 "Servo System for Magnetic Recording Based on Time Comparsion" Gruss et al., 7/80, pp. 787-789.
Electronics, "Magneto-Optics Packs 5 cm Disk with 10 Megabytes" Gosch, 12/29/82, pp. 45-46.
Behr Michael I.
Benson William
Bizjak John F.
Kenny Philip C.
Miller Scott D.
Brier Technology Inc.
Garland Steven R.
Psitos Aristotelis M.
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