Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1994-09-29
1997-03-25
Kim, W. C.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 53, G11B 1504
Patent
active
056150610
ABSTRACT:
The present invention provides a new and novel method for generating a identification number unique to a particular magnetic storage device. In a first preferred method, areas of a storage device which are defective are located. Then specific bad bits within the bad area are determined. The locations of the bad areas plus the location of the bad bits are used to create a identification number for the particular storage device. In a second preferred method, the surface of the magnetic storage device is read in the analog domain. The amplitude variations during the read process are used to generate a identification number for the storage device. Once a identification number is determined, it is used for preventing software piracy or other uses where a specific magnetic storage device needs to be identified.
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