Patent ID: 7978956

Claim:
A machine readable information recording medium embodied as an optical disc for access by an information reproducing apparatus comprising: a first area being configured to store a video file or an audio file, the video file or the audio file including a plurality of extents, one of said extents corresponding to a block, the video file or the audio file including an unrecorded area and an object, the unrecorded area being managed as at least the extents, the object having object units, each of the object units containing video packs including video data, audio packs including audio data and one begin pack, each of the video packs and the audio packs having predetermined size, and each said begin pack including recording time information of each of the object units respectively; and a second area being configured to store a management file, the management file including video management information, the video management information having program chain information, the program chain information containing cell information, the cell information representing a presentation period within the object, and the video file, the management file and a backup file being disposed under a rewritable video title set directory as a common subdirectory; and a third area being configured to store file management information, the file management information including a file entry (FE), the file entry specifying a location of the video file or the audio file containing the unrecorded area, the file entry including a short allocation descriptor having length information of the extent and position information of the extent, logical blocks and logical sectors being assigned on the medium, addresses for the logical blocks in the video file being assigned, address arrangement order in the video file being adapted to the description order of the allocation descriptors, and recorded extent areas being connected when the video data is reproduced, wherein the video management information is read and provided to reproduce the object by the information reproducing apparatus, and the object is accessed according to the read video management information.