Patent ID: 7050386

Claim:
An optical recording medium in which a plurality (N) of servo areas each including a clock mark, a first wobble mark and a second wobble mark, and a plurality (N) of data areas for performing information recording and reproduction are arranged alternately in a circumferential direction, wherein each of the servo areas is composed of a plurality of servo pattern areas arranged in a radial direction, which vary in a distance in the circumferential direction between the clock mark and the first wobble mark, and a distance in the circumferential direction between the clock mark and the second wobble mark; the plurality of servo pattern areas include the same number of tracks, and the number is less than N/(2×π) (π indicates a ratio of circumference to diameter); and the servo pattern areas adjacent to each other among the plurality of servo pattern areas are substantially equal in one of the distance in the circumferential direction between the clock mark and the first wobble mark and the distance in the circumferential direction between the clock mark and the second wobble mark.