Recording medium, information recording and reproducing method, and recording and reproducing apparatus
Conventionally, as in the case of switching between a DVD-R and a DVD-RAM, when the method of record mark arrangement in a track is changed, the physical format of the disk is also changed. This makes it difficult to ensure compatibility between pieces of data recorded by a plurality of different methods of record mark arrangement. According to the present invention, sector address data and block address data are recorded in each sector by using wobbling or deformation of a recording groove. Then, depending on which address is used, sector data structure is modified, thereby making it possible to select an address data detection and a structure on a disk in a single physical format depending on the purpose.
1. An information recording medium for recording information having a wobbling recording track, a first recording unit, a second recording unit comprising, as a physical format:
a first address representing the first recording unit being formed on the wobble in a first modulation;
a second address representing the second recording unit being formed on the wobble in a second modulation;
wherein a degree of the first modulation and a degree of the second modulation are different form each other.
2. An information recording medium according to claim 1 ,
wherein the second address dispersed across a plurality of fields in the second recording unit.
3. An information recording medium according to claim 1 ,
wherein the second recording unit comprises a plurality of the first recording units.
4. An information recording medium according to claim 1 ,
wherein the second recording units is longer than the first recording unit.
5. An information recording medium according to claim 1 ,
wherein the first recording unit is a sector, and the second recording unit is a block.