Patent ID: 7643389

Claim:
A file-based recordable disc playback apparatus characterized in comprising: an optical pickup for reading a signal from a recordable disc; a signal decrypting means which decrypts a signal read by said optical pickup; a subcode analyzing means which extracts subcode data from the signal decrypted by said signal decrypting means, and for analyzing said subcode data; a CD-ROM decoding means which decodes the signal decrypted by said signal decrypting means; a file system analyzing means which analyzes a file system on a basis of an output of said CD-ROM decoding means; a TOC information processing means which analyzes TOC data from an output of said subcode analyzing means; and a session information processing means which processes session information on a basis of the data analyzed by said TOC information processing means, and characterized in that said file-based recordable disc playback apparatus compares a starting address of each file which is analyzed by said file system analyzing means, said TOC information processing means, and said session information processing means with a region of each session so as to check to see whether there exists a file in each session, and causes said session information processing means to continue said processing until judging that there exists no session without file.