Write-once read-many information recording medium, information recording method, information reproduction method, information recording apparatus, and information reproduction apparatus

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 information recording medium contains at least one disc management area;
• in the at least one disc management area, the last disc management information and the last disc definition structure are provided;
• the last disc management information is the latest disc management information provided in the at least one disc management area;
• the last disc definition structure is a disc definition structure containing positional information about the last disc management information;
• and
• the last disc management information and the last disc definition structure are provided, wherein the last disc definition structure precedes the last disc management information in the predetermined direction.