Patent ID: 7924668

Claim:
A method of determining a write strategy to record data by irradiating an optical disc with a laser beam, the method comprising: a first step of determining modulation conditions for the data to be recorded on the optical disc, by recording repeated data of marks and spaces of a predetermined length on the optical disc, and reproducing the data, measuring a signal level, a cross talk level and a modulation of the data, and then determining the modulation conditions based on the results of the measurement; a second step of determining a first strategy that meets the modulation conditions; and a third step of measuring a record quality in the vicinity of the first strategy, and determining a second strategy; wherein the second step comprises: determining parameters of a write strategy for a shortest mark and then recording data on the parameters on the optical disc; and reproducing the data, measuring its asymmetry and mark edge position or mark length, and then determining the respective parameters of the first strategy based on results of the measurement.