Method and device for measuring disk drive alignment

Details Method and device for measuring disk drive alignment Method and device for measuring disk drive alignment

1990-11-21

1995-01-17

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, 360 31, 360135, G11B 5596, G11B 2736, G11B 582

Patent

active

053830709

ABSTRACT:
A test disk is used to measure disk drive alignment and other parameters without removing the drive from its computer system and without any need for special test equipment. It includes a pair of prerecorded signal tracks separated by a gap smaller than the width of the head so that one track is used for providing computer readable signals and the other is used to inject variable interference into the composite signal under the head. Multiple pairs of tracks at differing radii are included for measuring drive alignment and other parameters. The method for measuring alignment and other parameters suppresses measurement errors due to disk signal modulation and changes in track radius. Alignment testing requires only a single measurement and is capable of resolving the measurement to the nearest bit so that maximum accuracy is achieved.

REFERENCES:
patent: 4321636 (1982-03-01), Lenz
patent: 4458275 (1984-07-01), Monti
patent: 4513331 (1985-04-01), Baker et al.
patent: 4513333 (1985-04-01), Young et al.
patent: 4562494 (1985-12-01), Bond
patent: 4608618 (1986-08-01), Sturtevant-Stuart
patent: 4754343 (1988-06-01), Cascio, Sr. et al.
patent: 4992893 (1991-02-01), Kanai et al.
patent: 5023856 (1991-06-01), Raaymakers et al.
Xerox disclosure Journal vol. 1 No. 2 Feb. 1976 p. 75 W. B. Watson "Method of forming alignment".
"Computer technology Review" summer 1984 pp. 83, 86, 87 C. Bond System level drive dish tests can be performed efficiently by the user.

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