Plural-track record disk initialization system

Details Plural-track record disk initialization system Plural-track record disk initialization system

1977-02-17

1978-02-14

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

General recording or reproducing

360 77, G11B 502, G11B 2110

Patent

active

040743268

ABSTRACT:
Described is a transducer head assembly for magnetic disk files, the assembly using the informational data itself recorded on the disk in the form of a plurality of annular tracks for precisely positioning the head assembly with respect to the individual tracks. For this purpose, the assembly includes an upper head cooperable with the upper face of the record disk and a lower head cooperable with the lower face of the record disk, the lower head being spaced from the upper head one-half the distance between a pair of adjacent tracks such that one head may be used for positioning purposes by centering same between two adjacent tracks on the respective face of the disk, while the other head, being thereby centered with a track on its respective face of the disk, may be used for recording, reproducing or erasing data with respect to the latter track.
Also described is a scheme of recording the data at different clock frequencies on different tracks, such that the clock frequencies between adjacent tracks differ by at least 2%, with the maximum difference between the clock frequency of any particular track and the nominal clock frequency being less than 5%.

REFERENCES:
patent: 3947881 (1976-03-01), Dahill et al.
patent: 3994016 (1976-11-01), Moghadam

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