Flexible magnetic disc having track marking information recorded

Details Flexible magnetic disc having track marking information recorded Flexible magnetic disc having track marking information recorded

1980-04-02

1982-09-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360109, G11B 2110

Patent

active

043487033

ABSTRACT:
A method for recording track marking information on flexible magnetical information carrier discs, in which the circular tracks on one side of the disc are each divided into an information recording segment having an angular width of at least 270.degree. and a remaining track marking segment, and in this latter respective marking frequency signals are recorded so that each of these signal is distinguishable from those recorded on the two neighboring tracks.
The invention relates to an apparatus for fine adjustment of the position of a reading head in case of discs recorded by the above method. The apparatus comprises frequency selective means that selects the marking frequency components when track marking segments are played back. The difference of the sensed components are processed to a control signal which drives a control unit for adjusting the radial position of the head to the center line of a predetermined track. The invention is sensitive against excentricities of the track and it ensures almost a double storage capacity compared to conventional floppy discs, or it uses simple playback systems in which double head movement is not required.

REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3479664 (1969-11-01), Stuart-Williams et al.
patent: 3593333 (1971-07-01), Oswald
patent: 3840893 (1974-10-01), Jacoby et al.
patent: 3864740 (1975-02-01), Sordello et al.
patent: 3924268 (1975-12-01), McIntosh et al.
IBM/TDB, vol. 23, No. 1, Jun. '80, pp. 304-305, "Pattern for Buried Servo", by Howell.
IBM/TDB, vol. 23, No. 3, Aug. '80, pp. 1203-1210, "Improvement in the Positioning Error . . . ", by Handen et al.

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