Optical disk and optical disk drive device

An optical disk having information recording tracks in the form of land and groove tracks arranged in a land/groove single-spiral configuration in which land tracks are connected to adjacent groove tracks at connecting points which occur each revolution so that land and groove tracks alternate every revolution to form a continuous spiral;

• said disk being divided into a plurality of annular zones, each revolution of said information recording track belonging to one of the zones depending on the position of the revolution in the radial direction;
• each revolution of the information recording track being divided into a plurality of sectors of a unit length of information recording in a scanning direction;
• said disk having a header portion at the head of each sector, said header portion including a plurality of recognition patterns which are each formed of a plurality of pits, said header including a plurality of sub-headers that each include address pits and a recognition pattern formed of a plurality of pits, a first sub-header of said plurality of sub-headers having address pits that signify an address of a first sector and a second sub-header of said plurality of sub-headers having address pits that signify an address of a second sector, the address of the second sector being different than the address of the first sector, the address pits of the first sub-header being shifted in a first radial direction from a track center and the address pits of the second sub-header being shifted in a second radial direction, opposite the first radial direction, from the track center;
• and
• the interval between the recognition patterns in the header portion being varied.