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Abstract

An optical disk drive includes an optical pickup which emits a light beam onto an optical disk, and receiving a reflection light to output a signal in accordance with the reflection light, a PRML processing unit which carries out signal processing with respect to the signal output from the optical pickup using a partial response and maximum likelihood (PRML) technique, a focus offset setting unit which sets a focus offset value used for focusing the optical pickup based on a difference value between a signal processed by the PRML processing unit and the signal output from the optical pickup, and a focus control unit which controls a focus of the optical pickup in accordance with focus offset set by the focus offset setting unit.

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First Claim