Oblon, McClelland, Maier & Neustadt, L.L.P.
Information recording medium, information reproducing apparatus, management information reproducing method, information recording/reproducing apparatus and identification information reproducing/recording method
According to one embodiment, in an information recording medium including a plurality of data layers, at least one pre-format area is provided on each of the data layers and is circumferentially divided into a plurality of segments. Management information including data layer identification information for identifying the data layers is recorded in at least one of the segments in each of the data layers, using the marks include BCA marks extending radially uniformly. On adjacent ones of the data layers, the BCA marks associated with the management information are recorded in differently positioned segments which are not opposed to each other.
KABUSHIKI KAISHA TOSHIBA
G G G G
G11B G11B G11B G11B
additional inventional inventional inventional
Kazuaki Akihito Masahiro Kazuo Hidefumi Takashi Hideaki
Doi Ogawa Saito Watabe Takamine Usui Okano