Optimal power calibration method for an optical disc

An optimal power calibration (OPC) method for an optical disc of an optical system, the optical disc including a power calibration area which has a count area and a test area, the count area having a plurality of counting units, the test area having a plurality of test blocks corresponding to each of the counting units for printing test data, the method comprising:

• generating a plurality of first power levels by using an indicated power;
• selecting a plurality of second power levels from the first power levels;
• recording test data onto test blocks with the second power levels;
• reading the test blocks and generating data signals and first beta values;
• generating an estimated optimal power by a calculating algorithm;
• generating a plurality of third power levels by using the estimated optimal power;
• recording test data onto test blocks with the third power levels;
• reading the test blocks and generating data signals and second beta values;
• generating an optimal power from the estimated optimal power, the first beta values and the second beta values.