Patent ID: 7355947

Claim:
An optical disk device for recording and reproducing data with respect to grooves and lands of an optical disk in which address information is embedded by forming the grooves and the lands in wobbles, the address information being embedded after conversion into a gray code in which a distance between codes for two consecutive address values is equal to 1, in which the address information of the groove includes two address systems, which are a groove track address system defined by in-phase wobbles wherein the phase of the wobble on the inner radius side and the phase of the wobble on the outer radius side, forming the groove, are identical, and a land track address system defined by including opposite-phase wobbles wherein the phase of the wobble on the inner radius side and the phase of the wobble on the outer radius side, forming the groove, are reversed, the optical disk device comprising: means for demodulating a wobble signal obtained by reproducing the groove track address system to obtain first groove address information X; means for demodulating a wobble signal obtained by reproducing the land track address system to obtain second groove address information Y; and means for determining an error in the first groove address information X when the second groove address information Y does not satisfy either the relationship X=Y or the relationship X=Y+1 with respect to the first groove address information X.