Patent ID: 7587129

Claim:
A machine readable information recording medium embodied as a recordable optical disc for access by an optical disc drive 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, one 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 a corresponding video object unit; 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 representing a cell, the cell referring to a whole or a part of the video object, and the video file, the management file and a back up 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) specifying a location of the video file, and a File Identifier Descriptor (FID), the file entry (FE) including an allocation descriptor having length information on one of the extents and position information on the one of the extents, logical blocks and logical sectors being assigned on the information recording medium, the logical blocks being assigned logical block serial numbers, the position information on the one of the extents specifying one of the logical block serial numbers, the logical sectors being assigned logical sector serial numbers, a length of each of the logical sectors being 2048 bytes, and length of each of the logical blocks being 2048 bytes, the video management information including a beginning address of the video object expressed in AV address, and the video object being able to be allocated in some extent of the extents, wherein the video management information is read and 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.