Information recording medium, information recording apparatus and method, information reproducing apparatus and method, and computer program

Information recording medium (1000) includes a recording area for recording recording information (100), the first format (e.g., PS format) first the first recording information manages arrangement information area is recorded a first management information recording area for recording management information (120a) (120), a second format (e.g., TS format) second management for managing arrangement information of the region second recording information is recorded information (130a) the second management information recording area for recording (130), a free area management information recording area for recording the free area management information for managing the arrangement information of the free space (110a) (110) equipped with a.