Patent ID: 7304924
Filing Date: 2007-12-04
Classification: G11B

Abstract:
1. An optical disk device for recording or reproducing data with respect to grooves and lands of an optical disk in which address information is embedded by wobbling the grooves and the lands, the address information being embedded after conversion into gray code where the distance between codes for two consecutive address values is equal to 1, in which the address information of the lands includes two address systems, which are a land track address system defined by in-phase wobbles where the phase of the wobble on the inner periphery side and the phase of the wobble on the outer periphery side forming the lands are identical and a groove track address system defined by including reverse phase wobbles where the phase of the wobble on the inner periphery side and the phase of the wobble on the outer periphery side forming the lands are reversed, the optical disk device comprising: means for demodulating a wobble signal obtained by reproducing the land track address system to obtain first land address information; means for extracting second land address information from the groove track address system; and means for detecting an error in the first land address information by determining whether or not the first land address information and the second land address information correspond to each other.