Patent ID: 6621774
Filing Date: 2003-09-16
Classification: G11B

Abstract:
An optical disk device for conducting recording/playback of an optical disk comprising a land region and a groove region that are formed on a substrate, each of said land region and groove region being used as a recording track of a recording/playback information signal, and a pre-recorded region including address information, comprising:means for outputting a signal to detect whether a recording track scanned by a light beam is a land region or a groove region; a header region detection means for detecting a header region including the pre-recorded region; and a servo error detection means for: sampling a track error signal value at a first arbitrary time before an output time of said header region detection means; holding said track error signal value for a second arbitrary time; conducting an operation on said track error signal value and an arbitrary waveform signal; and outputting a result of said operation as a servo error signal.