Disk drive with stored positioning data related to disk expansio

Details Disk drive with stored positioning data related to disk expansio Disk drive with stored positioning data related to disk expansio

1986-12-19

1988-03-15

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 77, 318634, G11B 2108, G11B 2110

Patent

active

047316802

ABSTRACT:
A disk drive apparatus includes apparatus for elimination of off-track errors of a read/write head by deriving and storing correction data for all of the tracks on a disk on the basis of the signal level resulting from read-out of the contents of gap portions of the format data in two specific tracks. If, as indicated by a read error indication signal from a host computer, read errors subsequently occur in spite of position correction based on a stored correction value, then the off-track error for the track concerned is detected and an updated correction value is derived and stored. Accurate position control is thereby attained without a need for servo data tracks or regions to be recorded on each disk.

REFERENCES:
patent: 4122503 (1978-10-01), Allan
IBM TDB vol. 19, No. 3, "Track Location Correction Mechanism for Magnetic Disks", Hanson et al., 8/76, pp. 1039-1042.
"Refined Closed-Loop Servo Enhances Low-Cost Drive's Accuracy", by Larry Sarisky; Electronics/Mar. 10, 1983, pp. 139-142.

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