Data reproducing apparatus which prohibits illegitimate access to data using an internal ID

U.S. Patent Number: 5812512

Abstract: A disc driving apparatus for driving a disc recording medium on which a plurality of sets of user data and a plurality of unique data, each of which is related to each set of the user data, are recorded, and including a reproducing circuit for reproducing the unique data and the user data recorded on the disc recording medium, an error correction circuit for correcting errors in the data reproduced by the reproducing circuit and detecting an error rate of the data reproduced by the reproducing circuit, and a data replacement circuit for recording the unique data which is error-corrected by the error correction circuit in a replacement area of the disc recording medium when the error rate of the unique data is higher than a first reference error rate and for recording the user data which is error-corrected by the error correction circuit in the replacement area of the disc recording medium when the error rate of the user data is higher than a second reference error rate which second reference error rate is different from the first reference error rate.

Inventors: Tobita; Minoru (Tokyo, JP), Funahashi; Takeshi (Saitama, JP)

Assignee: Sony Corporation (Tokyo, JP)

Application Number: 08/661,304

Issued: 1998-09-22

Expired: 2006-09-22

Classes: 369/84 ; 369/30.19; 369/30.23

Field of search: 369/52,48,54,58,32 360/60,53 380/2,3,4,5

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