Patent ID: 7088647
Filing Date: 2006-08-08
Classification: G11B

Abstract:
1. A disk device of reading data from a disk recording medium, comprising: reading means reading signals written on a rotating recording medium and producing recorded signals and a tracking error signal out of the read signals; a phase encoder generating a signal of which characteristic varies according to phase of the rotating disk; a servo unit controlling tracking of an objective lens equipped in said reading means; and a controller storing information on dense/sparse state of the tracking error signal in connection with characteristic of the signal generated by said phase encoder while tracking servo of said servo unit is inactivated, and, in data reproduction mode, identifying a current disk phase based on characteristic of the signal generated by said phase encoder, and adjusting tracking characteristic of said servo unit based on the stored information in connection with the signal characteristic in order to compensate an effect rate of eccentricity on the identified disk phase, wherein said controller adjusts the tracking characteristic of said servo unit to sensitive if the signal characteristic stored in connection with the identified disk phase shows dense.