Patent ID: 7428202

Claim:
A write-once read-many 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 write-once read-many 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; and 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.