Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1990-11-02
1993-06-15
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
G11B 509
Patent
active
052204766
ABSTRACT:
A method for inscribing data onto a magnetic medium (12) wherein portions of an oxide coating (16) of the medium are removed from the medium (12) to create voids (88) while the oxide coating (16) is left undisturbed on areas adjacent to the voids (88). The adjacent areas are then uniformly magnetized. When the medium is moved past a read head (78), changes in magnetic field present at transition points (82) and (84) between the voids (88) and the uniformly magnetized oxide coating (16) of adjacent areas cause a current to be induced in a coil (80) of the read (78) head which current is interpreted by conventional read circuitry as being a data bit. The data inscribed by this method is not erasable by conventional means. The inventive method may be practiced upon selected portions of a medium (12) such that non-erasable data areas and conventional magnetically erasable data areas can coexist on the same medium (12).
REFERENCES:
patent: 3373997 (1968-03-01), Berndt et al.
patent: 3753252 (1973-08-01), Tietze
patent: 4584641 (1986-05-01), Guglielmino
patent: 4802050 (1989-01-01), Miyabayashi et al.
patent: 4961123 (1990-10-01), Godwin et al.
Godwin Jimmy D.
Williams Roger O.
Williams Stephen P.
Canney Vincent P.
Hughes Michael J.
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