Patent ID: 7574111

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 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 files 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 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 Identifier Descriptor (FID) and a file entry (FE) specifying a location of the video file, the file entry including a first allocation descriptor, the first allocation descriptor having length information on one of the extents and position information on the one of the extents, the file entry including an ICB tag specifying a file type, an unallocated area on the information recording medium being described by a space table, the space table including an unallocated space entry having second allocation descriptors, the unallocated space entry including byte number information indicating a length of the second allocation descriptors, and the file type indicating file data when the file type shows “5”, indicating a directory when the file type shows “4”, and indicating an unallocated space entry when the file type shows “1”, 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.