Patent ID: 7340155

Claim:
An information reproducing method for reproducing information from an information recording medium, said information recording medium comprising: a lead-in area located near a center position of rotation of the information recording medium; and a data area around the lead-in area, the data area divided into logical sectors, each of said logical sectors having a size of 2,048 bytes, the logical sectors being assigned logical sector serial numbers, a part of said logical sectors corresponding to logical blocks assigned logical block numbers respectively, wherein said data area comprises: a first area in which one video file is recorded, the video file including a recorded area and an unrecorded area, the recorded area being provided for a recorded video object, and the unrecorded area being provided for recording new video data or audio data, the video file including a plurality of extents allocated on the recorded area and the unrecorded area, one of the extents corresponding to a block in said data area, the recorded video object having video object units, each of the video object units containing video packs including the video data or audio packs including the audio data, and one begin pack, the begin pack and each of the video packs and the audio packs having predetermined size, and said begin pack including recording time information of corresponding video object unit; a second area in which a management file is recorded which is recorded when the new video data or audio data 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 representing a presentation period within the recorded video object, and the video file, the management file and a backup file for the management file being stored under a DVD_RTR directory as a common subdirectory; and a third area in which file management information is recorded, the file management information including a file entry (FE), 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 of the one of extents and position information of the one of extents, and the unrecorded area being changed to a new recorded area, when the new video data or audio data is recorded in the unrecorded area, the reproducing method comprising: reading the video management information; and accessing the video file or the audio file and reproducing data included in the video file or audio file.