Index adjustment circuit for floppy disk drive

Details Index adjustment circuit for floppy disk drive Index adjustment circuit for floppy disk drive

1991-03-12

1993-12-21

Zazworsky, John

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 7303, 360132, G11B 1518, G11B 1552

Patent

active

052725774

ABSTRACT:
A floppy disk drive (FDD) includes a writable non-volatile memory which stores information indicative of a correction amount due to a difference between the reference position of a medium for the FDD and the position of an index detected by an index sensor and a digital delay circuit for deciding an adjustment time by producing an index signal which is provided by delaying the index detection pulse supplied from the index sensor by a count value corresponding to the correction amount supplied from the non-volatile memory. The index adjustment pulse is delayed by the count value so that the relative positions of indices of several FDD's can be made coincident with each other.

REFERENCES:
patent: 4815063 (1989-03-01), Aoshima et al.
patent: 4908810 (1990-03-01), Oie
patent: 5068755 (1991-11-01), Hamilton et al.
patent: 5150340 (1992-09-01), Miura et al.
L. R. Bellamy et al., "Disk Drive Motor Speed Control" IBM Technical Disclosure Bulletin vol. 23 No. 11 Apr. 1981 p. 5163.

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