Patent ID: 8004941
Filing Date: 2011-08-23
Classification: G11B

Abstract:
1. An optical disk apparatus for adjusting a recording condition by test writing when a laser beam is irradiated on an optical disk for recording data, the apparatus comprising: a spindle motor which rotates the optical disk; a pickup which irradiates the laser beam on test writing areas of the optical disk to record and reproduce a test signal; a signal processing unit which obtains a reproduced signal of the test signal, and a focus error signal or a tracking error signal from a signal detected by the pickup; a defect detecting unit which detects defects on the optical disk on the basis of a fluctuation amount of the obtained focus error signal or tracking error signal; and a test writing processing unit which supplies the test signal to the pickup and assesses the quality of the reproduced signal of the test signal that is obtained by the signal processing unit to adjust the recording condition, wherein the test writing processing unit records the test signal to an adjacent area in a testing area while skipping areas where the defects are detected by the defect detecting unit, and reproduces the test signal while skipping the areas where the defects are detected.