Recording quality evaluation method of optical disk and optical disk storage system

A recording quality evaluation method of an optical disk that evaluates the degradation of the quality of data recorded on the optical disk, the recording quality evaluation method comprising the steps of:

• every time when recording or reproducing user data on or from a data area of an optical disk, recording or reproducing a test signal repeatedly on or from a test area of the optical disk every time;
• reproducing the test signal recorded on the test area at a predetermined timing;
• and
• calculating the degradation of the quality of the user data from the evaluation result of the quality of the test signal.

An optical disk storage system for recording data on an optical disk and evaluating the degradation of the quality of the recorded data, the optical disk storage system comprising:

• a recording/reproducing unit for recording and reproducing data on and from the optical disk;
• and
• a quality evaluation unit for evaluating the quality of the reproduced data,
• wherein, at the time of recording user data on the optical disk, the recording/reproducing unit records a test signal including a component in which the signal level is smaller than a reference value, on a test area of the optical disk,
• wherein the recording/reproducing unit reproduces the test signal recorded on the test area when a predetermined period of time has passed,
• wherein the quality evaluation unit calculates the degradation of the quality of the user data from the evaluation result of the quality of the reproduced test signal.

An optical disk storage system for recording data on an optical disk and evaluating the degradation of the quality of the recorded data, the optical disk storage system comprising:

• a recording/reproducing unit for recording and reproducing data on and from the optical disk;
• and
• a quality evaluation unit for evaluating the quality of the reproduced data,
• wherein the recording/reproducing unit records or reproduces a test signal repeatedly on or from a test area of the optical disk, every time when recording or reproducing user data on or from the optical disk,
• wherein the recording/reproducing unit reproduces the test signal recorded on the test area at a predetermined timing,
• wherein the quality evaluation unit calculates the degradation of the quality of the user data from the evaluation result of the quality of the reproduced test signal.