Information recording medium having wobbled groove structure

An information recording medium having a spiral or concentric-shaped groove structure along a track formed on a disk-like substrate, wherein:

• the groove structure is wobbled in a radius direction of the medium;
• the track is divided into a plurality of recording units in the track direction by at least one radial boundary line;
• at least two adjacent recording units in the radius direction of the medium comprise one zone;
• and
• the groove structure which is adjacent to each other in the radius direction of the medium within one zone has substantially the same wobbling cycle.

An information recording medium having a spiral or concentric-shaped groove structure along a track formed on a disk-like substrate, wherein:

• the groove structure is wobbled in a radius direction of the medium;
• the track is divided into a plurality of recording units in the track direction by at least one radial boundary line;
• at least two adjacent recording units in the radius direction of the medium comprise one zone;
• and
• the groove structure of the adjacent recording units in the radius direction of the medium within one zone has substantially the same wobbling cycle and the same number of wobbling.