Method and apparatus for tolerating track misregistration system

Details Method and apparatus for tolerating track misregistration system Method and apparatus for tolerating track misregistration system

1986-10-27

1989-01-17

Faber, Alan

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 46, 360118, G11B 5024, G11B 5265

Patent

active

047991151

ABSTRACT:
Track misregistration between a read-back head and a previously recorded pair of tracks can cause erroneous data to be detected by the read head. It has been discovered that a prior erasure to eliminate any residual magnetization reversals occurring between and along side of the two parallel data tracks in twin track vertical recording can unexpectedly increase track misregistration tolerance by several hundreds of percents over the tolerance exhibited by twin track vertical recording having no pre-write erasure in the space between tracks and along side of the tracks. The erase before write technique may be practiced with a new read-write head structure having an E-shaped erase core aligned with the twin track read-write head and insulated from it to precede the read-write structure in the direction of relative motion between the read-write head structure and the magnetic medium.

REFERENCES:
patent: 2857585 (1958-10-01), Dickinson
patent: 3859664 (1975-01-01), Chynoweth et al.
patent: 3882544 (1975-05-01), Hughes
patent: 4484238 (1984-11-01), Vinal
patent: 4626946 (1986-12-01), Vinal
patent: 4644421 (1987-02-01), Miwa et al.
patent: 4698711 (1987-10-01), Vinal

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