Patent ID: 7746739
Filing Date: 2010-06-29
Classification: G11B

Abstract:
1. A recording power determining method comprising: preparing recording power values on the basis of a start power and step power according to a recording speed; writing data into a plurality of test blocks arranged consecutively on an optical disc while changing a recording power in such a manner that a difference of the two power values applied to adjacent two test blocks of any adjacent pair in the test blocks is twice the step power or larger; reproducing an information recorded in the test blocks written into consecutively; determining asymmetry values for each of the recording power values on the basis of the information in each of the test blocks reproduced; determining an approximation characteristic of the asymmetry values for a recording power on the basis of the asymmetry values for each of the recording power values; and determining optical power values for realizing a specific target values of the asymmetry values from the obtained approximation characteristic.