Flexible magnetic disk system

Details Flexible magnetic disk system Flexible magnetic disk system

1980-08-22

1983-02-01

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2110

Patent

active

043719040

ABSTRACT:
A simple flexible magnetic disk memory system is provided which enables precise positioning of a read/write head to follow a data track, despite non-uniform expansion or contraction of the disk. Several positioning sectors of the disk are formed which have positioning tracks recorded thereon, and several corresponding holes are punched in the disk to enable an optical sensor to determine the sector locations. Although a step motor positions a head at the approximate middle of a selected data track, an analog circuit repeatedly adjusts the head location as each positioning sector passes the head. Four positioning sectors can be used which are each aligned with or angled by 90.degree. from the direction of machining of the sheet material of which the disk was made, to minimize track run-out in each data region that lies between positioning sectors.

REFERENCES:
patent: 3924268 (1975-12-01), McIntosh et al.
patent: 4016603 (1977-04-01), Ottesen
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4188646 (1980-02-01), Sordello et al.
Jahnke, "Track-Locating . . . File", IBM Tech. Disc. Bull., vol. 23, No. 2, Jul. 1980, p. 738.

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