Apparatus for, and methods of, recording signals in tracks on a

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format

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360 51, G11B 509

Patent

active

055195466

ABSTRACT:
A head records a track (e.g. a servo track) in a memory member outside of a clean room without using reference indices. In each of a plurality of cyclical movements (e.g. revolutions), signals (e.g. servo signals) are recorded in the track in an individual number of frames. Thereafter the distance of the unrecorded portion of the track is determined. In the next cyclical movement, the head records signals in an individual number of frames contiguous to the frames previously recorded, in a track distance dependent upon such individual number relative to the number of frames still unrecorded and upon the distance determined for the unrecorded track portion. In a last cyclical movement, the head records a single frame in a particular spatial relationship with the first and last frames. In a specific embodiment, 2.sup.N-K frames may be recorded in the K cyclical movement. Additional signals may thereafter be recorded by the head in tracks in a single cyclical movement. In another embodiment, each individual number of frames continue to be recorded in the first track in each cyclical movement until the frames occupy a distance, within particular limits, dependent upon the unrecorded length of the track and upon the individual number of frames relative to the number of frames still unrecorded. In a further embodiment, sectors and data sectors following the sectors are recorded with signals in progressive cyclical movements in a manner similar to the recording of the sectors in such revolutions in the first embodiment.

REFERENCES:
patent: 3531787 (1970-09-01), Fuller
patent: 3540022 (1970-11-01), Berger
patent: 3893172 (1975-07-01), Celek
patent: 4068268 (1978-01-01), Idemoto et al.
patent: 4131920 (1978-12-01), Berger
patent: 4371902 (1983-02-01), Baxter et al.
patent: 5153788 (1992-10-01), Nishikawa et al.
patent: 5164863 (1992-11-01), Janz
patent: 5164866 (1992-11-01), Sano et al.

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