Information recording medium and reproduction device
An optical disk ( 100 ) of the present invention includes (i) a medium information region ( 101 ) (a) in which type identification information is recorded by recesses and/or protrusions which are formed by a given modulation method and whose lengths are longer than a length of an optical system resolution limit of a playback device and (b) in which first address information is recorded in a first address data format and (ii) a data region ( 102 ) (a) in which content data is recorded by recesses and/or protrusions which are formed by the given modulation method and which include a recess and/or a protrusion whose length is shorter than the length of the optical system resolution limit and (b) in which second address information is recorded in a second address data format.
1. An information recording medium comprising:
a first region in which type identification information for identifying a type of the information recording medium is recorded by recesses and/or protrusions which are formed by a given modulation method and whose lengths are longer than a length of an optical system resolution limit of a playback device; and
a second region in which content data is recorded by recesses and/or protrusions which are formed by the given modulation method and which include a recess and/or a protrusion whose length is shorter than the length of the optical system resolution limit, wherein
the first region containing first address information recorded therein in a first address data format,
the second region containing second address information recorded therein in a second address data format that differs from the first address data format, and
the second address data format includes cluster addresses with a greater number of bits than a number of bits included in cluster addresses in the first address data format.
2. A playback device for playing back an information recording medium recited in claim 1 ,
said playback device comprising:
a first address information decoding process section that decodes the first address information recorded in the first region; and
a second address information decoding process section that decodes the second address information recorded in the second region.