Patent ID: 7623761

Claim:
An information recording medium being configured to have data that is recorded thereon and reproduced therefrom by an information recording/reproducing apparatus, said information recording medium comprising: a lead-in area being located on an inner circumference side of the information recording medium; and a data area being located on an outer circumference side of the lead-in area, the data area being divided into logical sectors, each of said logical sectors having a size of 2,048 bytes, logical sector serial numbers being assigned to the logical sectors, and a part of said logical sectors corresponding to logical blocks to which logical block numbers are assigned respectively, wherein said data area comprises: a first area being configured to store a video file, the video file including an unrecorded area and an object, the unrecorded area being able to store new video data, the unrecorded area being managed as at least an extent, the object having object units, each of the object units containing video packs and audio packs, one of the object units containing one begin pack, each of the video packs and the audio packs having predetermined size, said begin pack including recording time information on the object unit, the recording time information being expressed by year, month, day, hour, minute and second; a second area being configured to store a management file, 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 object; and a third area being configured to store file management information, and the file management information including a file entry that specifies a location of the video file, wherein the file management information is able to be obtained by reading the information recording medium, the video management information included in the management file is able to be read and stored into a memory, the object is able to be read, some amount of data of the object is able to be buffered, the data of the object is able to be decoded, the video management information provides a functionality with respect to the video file such that when processed by the information recording/reproducing apparatus, the object is managed and accessed according to the video management information.