Method for determining an optical write power and an optical disc access system using the same

An optical disc access system, comprising:

• an access device, to write data to an optical disc using CLV format, a first power calibration area and a second power calibration area defined on the inner area and the outer area of the optical disc respectively, and a data storage area defined between the first power calibration area and the second power calibration area;
• and
• a control device, to determine an optical write power for writing in data onto the optical disc and control an operation of the optical disc access system,
• wherein the control device determines a first rotation speed required by the optical disc to perform a power calibration by writing a data onto the first power calibration area at a data writing speed;
• wherein when the first rotation speed exceeds a first rotation speed limit, the control device performs the write power calibration on the second power calibration area, and otherwise, the control device performs the write power calibration on the first power calibration area.

A method for determining a write power of a readable/writable optical disc using an optical disc access system, the readable/writable optical disc having a data record area, a first power calibration area and a second power calibration area, the first power calibration area and the second power calibration area respectively formed on the inner area and the outer area of the readable/writable optical disc, the data record area formed between the first power calibration area and the second power calibration area, the method comprising the steps of:

• choosing a data writing speed to the optical disc access system in order to write a predetermined amount of data in the data record area within a unit of time, wherein the unit of time is machine-dependent;
• calculating a first rotation speed according to the data writing speed such that the optical disc access system writes the predetermined amount of data in the first power calibration area within the unit of time when the optical disc access system rotates the readable/writable optical disc at the first rotation speed;
• performing of a write power calibration on the first power calibration area by the optical disc access system when the first rotation speed does not exceed a first rotation speed limit;
• and otherwise
• performing of a write power calibration on the first power calibration area by the optical disc access system when the first rotation speed exceeds the first rotation speed limit.