Patent ID: 7050384

Claim:
A data management information obtaining method for obtaining data management information concerning a recording of data recorded on each of data areas divided in a recording area of an information recording medium as a response to a request for obtaining the data management information, the method comprising: the step of obtaining said data management information including information concerning a plurality of predetermined data areas among said data areas as information concerning a predetermined pseudo area in response to said request for obtaining said data management information, wherein said recording area includes at least one session including tracks as said data areas, and said data management information includes at least one of a number of the sessions included in said recording area, a number of the tracks included in said recording area, and a track address indicating a recording position of each of the tracks specified by a track number, and wherein said request for obtaining said data management information includes a request for obtaining said number of said tracks, and said number of said tracks is calculated in response to said request for obtaining said number of said tracks by regarding at least one close session for which the recording of the data is completed among said sessions included in said recording area as a pseudo track, the pseudo track being said predetermined pseudo area.