Process for direct over-writing of digital data recorded on magn

Details Process for direct over-writing of digital data recorded on magn Process for direct over-writing of digital data recorded on magn

1986-03-07

1987-07-07

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369100, 369 54, 369 58, 360 53, 360 57, G11B 5024, G11B 509, G11B 1100

Patent

active

046791809

ABSTRACT:
Methods for directly over-writing the binary data value of a bit of digital data, stored in a particular one of a multiplicity of microscopic storage regions of a thin-film magneto-optic recording layer, first locate the storage region and non-destructively read the stored data value therefrom, and then compare the recovered value against the data value of an information bit to be stored in the same storage region. If the comparison indicates that no change in the stored data value is required, then the process proceeds to read and compare the next bit of data, from the next associated storage location. If the comparison indicates that a reversal of the magnetic moment of that region is required to store the new data value, a source of energy is energized to heat the particular storage region of a sufficiently high temperature that the self-demagnetization field of the recording layer material inverts the net magnetic moment of that region. Multiple over-writing of the long-term stable stored data values can be provided.

REFERENCES:
patent: 3810236 (1974-05-01), Horowitz et al.
patent: 3965463 (1976-06-01), Chaudhari et al.

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