Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1979-02-16
1982-10-12
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
G11B 2110
Patent
active
043542107
ABSTRACT:
Binary bits on a magnetic storage medium are read by a magnetic head that moves at approximately constant speed relative to the medium. The medium includes several elongated adjacent magnetic tracks, each including a succession of longitudinally positioned polarized magnetic flux variations arranged in elemental areas of equal length along the length of each track. Adjacent areas are susceptible to having like and unlike magnetic flux polarizations. The head and tracks are positioned so the head straddles a pair of the tracks and is simultaneously responsive to flux variations in the straddled tracks. The head and track move relative to each other so the head is responsive to successive flux variations as time progresses. The areas are arranged so there is always a magnetic flux polarization transition at predetermined equi-spaced positions along the track length at a boundary between a pair of elemental areas. The transition direction at each boundary indicates a binary bit value. The fluxes of the elemental areas between adjacent boundaries selectively have different polarity variations to assure that like polarity transitions at each boundary represent like binary bit values.
REFERENCES:
patent: 3864741 (1975-02-01), Schwarz
patent: 4151571 (1979-04-01), Cardot et al.
"Servo Sector Method"-Deremer et al., IBM Tech. Dis. Bul., vol. 20, #8, J 78.
Canney Vincent P.
Compagnie Internationale pour l'Informatique Cii-Honeywell Bull
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