INFORMATION RECORDING MEDIUM, RECORDING APPARATUS, REPRODUCTION APPARATUS, RECORDING METHOD, REPRODUCTION METHOD, AND DEFECT MANAGEMENT METHOD

摘要

Information recording media 101 and 102 usable for either a first recording density D1 or a second recording density D2 each include a user data area 106 in which user data is to be recorded, a first defect management information area 108 in which first defect management information for managing a defect area in the user data area is to be recorded, and a second defect management information area 109 in which second defect management information having an identical content to that of the first defect management information is to be recorded. The first and second defect management information areas 108 and 109 are located such that angles Theta1 and Theta2 made by start blocks thereof fulfill the relationships of 150°<= Theta1 and <=210°and 150°<= Theta2 and <=210°(Theta1: in the case of the first recording density, and Theta2: in the case of the second recording density).