Transducer head assembly and apparatus for using same in a plura

Details Transducer head assembly and apparatus for using same in a plura Transducer head assembly and apparatus for using same in a plura

1974-11-27

1977-06-14

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2110

Patent

active

040301303

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 later 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: 3479664 (1969-11-01), Stuart-Williams et al.
patent: 3534344 (1970-10-01), Santana
patent: 3821804 (1974-06-01), Stevenson et al.

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