Patent ID: 7587130

Claim:
A machine readable information recording medium embodied as a recordable optical disc for access by an optical disc drive, the information recording medium comprising: a first area in which a video file is recorded, the video file including a plurality of extents, the video file including an unrecorded area and a video object, the unrecorded area being able to store new video data, the unrecorded area being managed as at least one of the extents, the video object having video object units, each of the video object units containing video packs, audio packs and one begin pack, each of the video packs and the audio packs having predetermined size, and said begin pack including recording time information on each of the video object units respectively; and a second area in which a management file is recorded, the management file including video management information, the video management information having program chain information, the program chain information containing cell information, and the cell information describing a presentation period within the video object, and the video file, the management file and a backup file being stored under a DVD-RTR directory; and a third area in which file management information is recorded, the file management information including a file entry (FE), and a file identifier descriptor (FID), the file identifier descriptor (FID) describing a recording location of the file entry, the file identifier descriptor (FID) including a descriptor tag which contains “257”, the file entry specifying a location of the video file, the file entry including a short allocation descriptor, the short allocation descriptor having length information on the one of extents and position information on an extent, and the file entry including a descriptor tag which contains “261”, an unallocated area on the information recording medium being described by a space table, the space table including an unallocated space entry which relates to unallocated portions, and the unallocated space entry including allocation descriptors, the unallocated space entry including byte number information indicating a length of the allocation descriptors, and the unallocated space entry including a descriptor tag which contains “263”, wherein the video management information is provided to control recording, playing back, or editing the video file by an information recording/reproducing apparatus, the video file is accessed according to the video management information.