Patent ID: 7536083

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, 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 a predetermined size, and said begin pack including recording time information on the 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, 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; 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 entry specifying a location of the video file, the file entry including a short allocation descriptor having length information on said one of extents and position information on an extent, logical blocks and logical sectors being assigned on the information recording medium, logical sector numbers being assigned the logical sectors, a length of each of the logical sectors being 2048 bytes, a length of one of the logical blocks being equal to the length of one of the logical sectors, and logical block numbers being assigned to the logical blocks; and a fourth area in which a volume recognition sequence is recorded, the fourth area being included in the third area, the volume recognition sequence being included in the file management information, a part of the logical sector numbers being assigned to the fourth area, the logical block numbers being not assigned to the fourth area, and the volume recognition sequence including a beginning extent area descriptor, 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.