Patent ID: 7218844

Claim:
An AV data recording apparatus, comprising: a recording/reproducing section for recording AV data onto a disk and reproducing the recorded AV data; and a system control section for controlling a method of recording/reproducing AV data, wherein the apparatus has extent management information for managing continuous blocks on the disk as an extent, the apparatus has file management information for managing a group of the extents as a file, the apparatus has directory information for managing a group of the files as a directory, an area in a user area is kept as a reservation extent for recording at least any one of the directory information, the file management information, a part of the file, and a whole of the file, and when the data is recorded on the disk and a remaining capacity of the reservation extent that has been kept previously becomes insufficient, another reservation extent different from the reservation extent is kept in the user area on the disk to record at least any one of the directory information, the file management information, a part of the file, and a whole of the file.