Optical disk apparatus and test writing method
AssigneesHitachi, Ltd., Hitachi-LG Data Storage, Inc.
InventorsKoichiro Nishimura, Toru Kawashima, Mitsuru Harai, Tsuyoshi Toda
Life of this patent
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Abstract
Test writing is executed while skipping areas where deviations are present on an optical disk to thereby improve accuracy and reliability of an optimum recording condition to be derived. A deviation detecting unit detects the deviations of a guide groove on the optical disk on the basis of a fluctuation amount of a focus error signal or a tracking error signal, and registers information of the detected deviations onto a memory. A test writing processing unit refers to the memory, and records and reproduces a test signal while skipping the areas where the deviations are detected.
Claims8
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 deviation detecting unit which detects deviations of a guide groove 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 assessing 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 while skipping areas where the deviations are detected by the deviation detecting unit, and reproduces the test signal while skipping the areas.
A test writing method for adjusting a recording condition when a laser beam is irradiated on an optical disk for recording data, the method comprising the steps of:
- obtaining a focus error signal or a tracking error signal from areas on the optical disk where test writing is performed;
- detecting deviations of a guide groove on the optical disk on the basis of a fluctuation amount of the obtained focus error signal or tracking error signal;
- recording a test signal while skipping areas where the deviations are detected, and reproducing the test signal while skipping the areas;
- and
- assessing the quality of the reproduced test signal to adjust the recording condition.
Dependencies are inferred from the claim text.