Patent ID: 7522505

Claim:
An optical memory device for recording and reproducing information by forming marks and lands in an optical information recording medium, the optical memory device comprising: write strategy setting part which measures a deviation in information recorded in a test area within the optical information recording medium and which sets a write strategy according to the deviation; write strategy determining part for recording information in the test area using the write strategy set by the write strategy setting part, evaluating deviations in the recorded information, and repeatedly executing a processing performed by the write strategy setting part to determine an optimal write strategy such that the deviation is within a predetermined range; and write strategy storing part for storing the determined write strategy by the write strategy determining part, wherein the write strategy determining part comprises: measuring part for measuring lengths of the marks and lands recorded in the optical recording medium; measuring value memorizing part for memorizing a result of the measuring part; theory length memorizing part for memorizing theoretical lengths of the marks and lands; deviation value computing part for computing deviation values of the marks and lands by changing the write strategy on the basis of the lengths of the marks and lands memorized in the measuring value memorizing part and the lengths of the mark and land memorized in the theory length memorizing part; contractile rate computing part for computing inherent contractile rates of all marks and lands from the computed deviation value and an existing probability of each of the marks and lands; and write strategy correcting part for computing a correction value for a reference write strategy on the basis of the inherent contractile rate of and the existing probability of all the marks and lands such that the deviation values of all the marks and lands are within the predetermined range, and correcting the write strategy on the basis of the correction value.