Process for determining data disk track centers

Details Process for determining data disk track centers Process for determining data disk track centers

1987-07-24

1989-03-28

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7708, 360 7813, G11B 554, G11B 556, G11B 2110

Patent

active

048169382

ABSTRACT:
A process for determining the center of data disk tracks. The transducer head is positioned to one side of a track. The head repeatedly reads the track and microsteps across the track. The number of microsteps taken at the position on each side of the center of the track where a certain number of error correction code errors occur, are designated as boundaries of that track. The center of the track is then calculated as being half-way between the boundaries. By using the microstep off-sets for the centers of two tracks on a data disk, a correction factor can be calculated to compensate for thermal expansion of the data disk.

REFERENCES:
patent: 4122503 (1978-10-01), Allan
patent: 4445153 (1984-04-01), Fujimoto et al.
patent: 4499510 (1985-02-01), Harding et al.
patent: 4563713 (1986-01-01), Cahoon et al.
patent: 4581567 (1986-04-01), Yanagawa et al.
patent: 4620244 (1986-10-01), Krause
IBM TDB, vol. 19, No. 6, "Self-Calibrating Disk Storage Apparatus", Griffiths et al., 11/76, pp. 1991-1992.

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