Patent ID: 6532209
Filing Date: 2003-03-11
Classification: G11B

Abstract:
An optical information recording medium recording and reproduction method for recording and reproducing an information signal on/from both of concave portions and convex portions of guide grooves formed on a recording medium, the recording medium having a substrate on which the guide grooves consisting of the concave portions and the convex portions are formed, and a recording thin film, formed on the guide grooves, on which variations to be detected optically are generated by irradiation of light,the optical information recording medium recording and reproduction method comprising the steps of: performing a trial recording by irradiating light beams modulated with a plurality of different power levels onto concave portions and convex portions of a test zone before the information signal is recorded on the recording medium, the test zone including the same guide grooves as the guide grooves of an information recording zone and being located close to the information recording zone on the recording medium; demodulating information signals resulting from recording marks obtained by the trial recording; and determining an optimum recording power with respect to each of the concave portions and the convex portions of the guide grooves based on a demodulation result.