Magnetic recording/reproducing method

Details Magnetic recording/reproducing method Magnetic recording/reproducing method

1995-09-28

1998-02-03

Cangialosi, Salvatore

Cryptography

Electric signal modification

Having magnetic record carrier

380 4, 360 18, H04L 900

Patent

active

057153132

ABSTRACT:
Information is recorded on a floppy disk in a state in which the confidentiality of the information is maintained. An ID signal representing ID information is magnetically recorded down to the lower layer of a floppy disk when data is recorded. A data signal representing information (a data file) to be recorded is also magnetically recorded down to the lower layer of the floppy disk. A security signal is magnetically recorded on the upper layer of the floppy disk over at least the data signal that has been recorded on the lower layer of the floppy disk. At the time of data reproduction, the ID signal is reproduced from the floppy disk and the ID information represented by the reproduced ID signal is compared with entered ID information. When the two items of compared ID information agree, the security signal that has been recorded on the upper layer of the floppy disk is erased. The data signal that has been recorded on the lower layer of the floppy disk is then reproduced.

REFERENCES:
patent: 4785361 (1988-11-01), Brotby
patent: 5027396 (1991-06-01), Platteter et al.
patent: 5058162 (1991-10-01), Santon et al.
patent: 5206494 (1993-04-01), Metzger
patent: 5293422 (1994-03-01), Loiacono
patent: 5295187 (1994-03-01), Miyoshi
patent: 5365586 (1994-11-01), Indeek et al.
patent: 5408505 (1995-04-01), Indeck et al.
patent: 5572589 (1996-11-01), Waters et al.

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