Patent ID: 7852722
Filing Date: 2010-12-14
Classification: G11B

Abstract:
1. An optical disk apparatus comprising: a signal processing unit including an adaptive Viterbi decoder and an adaptive equalizer to process a readout signal from an optical disk during a playback operation; detecting means which detects read error factors in a recording unit block of the readout signal; a list in which playback operation parameters to be applied in a read retry are registered for each of the read error factors; and a controller which controls the playback operation and, when a read error occurs, performs the read retry by referring to the list, and by applying the playback operation parameters corresponding to the read error factor detected by the detecting means during the playback operation, wherein the signal processing unit further detects an isolated block followed the recording unit block that is in an unrecorded state from the readout signal, and wherein the controller performs the read retry on the isolated block detected by the signal processing unit.