Patent ID: 7369747

Claim:
An information medium embodied as a recordable optical disc for use with an optical disc drive, said recordable optical disc comprising a data area in which stream data is recorded in a predetermined data recording unit, and a management area in which management information that pertains to the stream data is recorded, wherein the recordable optical disc physically comprises a lead-in area located near a center of rotation of the disc, and the data area located outside of the lead-in area, said recordable optical disc including sectors for storing recorded information, and said recordable optical disc comprising: first management information, stored in the management area, used to access the stream data by indicating which of the predetermined data recording units includes an access unit that is suitable for individual playback; and second management information, stored in the management area, indicating a relationship between the first management information and third management information, stored in the management area, being different from the first management information, wherein said first management information includes access unit start map information, said second management information includes presentation time stamp list information, and said management area records entry point information based on a packet arrival time of data packets including contents of the stream data.