Apparatus for detecting presence of information data for use in

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G11C 2900

Patent

active

056235054

ABSTRACT:
An information data detecting apparatus for use in a recording medium playing apparatus detects the presence/absence of information data under software control using an error correction code. The information data detecting apparatus acquires a read signal representing the contents of a specified sector, extracts digital data from the read signal, performs an error-correcting operation on the extracted digital data and produces an error-correctable indicating flag when error correction is possible. When detecting the presence of the error-correctable indicating flag, the information data detecting apparatus produces a written-state signal indicating that the specified sector is used.

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patent: 5299208 (1994-03-01), Blaum et al.

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