Patent ID: 7496018

Claim:
An information recording medium, wherein: at least one disc management working area is sequentially allocated in a predetermined direction; in the at least one disc management working area, disc management information, which is management information about the information recording medium, and disc definition structure containing positional information about the disc management information, are provided; latest disc management information and latest disc definition structure are provided, wherein the latest disc management information precedes the latest disc definition structure in the predetermined direction; the latest disc management information is disc management information provided in a recorded disc management working area neighboring a border between the recorded disc management working area and an unrecorded disc management working area; the latest disc definition structure is a disc definition structure containing positional information about the latest disc management information; the latest disc definition structure is provided at a predetermined position in the recorded disc management working area neighboring the border, the predetermined position being capable of being calculated based on the border as a reference; the disc management information has a variable size; and the disc definition structure has a fixed size.