Patent ID: 6266318
Filing Date: 2001-07-24
Classification: G11B

Abstract:
A CLV-type recordable optical disk including a plurality of tracks, whereinthe tracks are formed with 2.pi.Tp/.lambda. substantially equal to an even-number multiple of 0.5, where Tp is a track pitch and .lambda. is a wavelength of a track wobble,each of the tracks is divided into a plurality of address sections each including a first predetermined number of wobble waves, and each of the address sections is divided into a plurality of small-size sections each including a second predetermined number of the wobble waves,an information recording area having a length smaller than a half of a length of the small-size section is set, for each of the tracks, in each particular one of the small-size sections of the track located where there occurs no overlap in the information recording area, in a radial direction of the optical disk, between the track and tracks adjoining the track,one piece of address information for each of the address sections is divided into a plurality of address information elements that are allotted to respective ones of the information recording areas within the address section, andthe track wobble at a predetermined position within each of the information recording areas having the address information elements allotted thereto is recorded with 180.degree.-two-phase modulation performed thereon in accordance with the allotted address information, the track wobble in non-information recording areas being recorded in non-modulated form.