Importance

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Abstract

First identification data and second identification data are read out from a phase-change optical storage medium having a light-incident surface through which a light beam is to be incident and at least a first film-laminated layer structure and a second film-laminated layer structure provided over the surface in which the first structure is provided as closer to the surface than the second structure is. Each structure has at least a recording film. The data indicates first recording requirements to the first structure. The second data indicates second recording requirements to the second structure. The first and second requirements are different from each other. Given data to be recorded is modulated into modulated data. A data-recording signal having at least one mark followed by a space is generated based on the modulated data. The mark has a mark length nT ('T' being a unit dock cycle, and 'n' being a positive integer of 3 or larger but 14 or smaller). Recording is controlled as to whether to record the data to the first or the second structure based on the first and second data. A first recording pulse sequence is generated based on the first requirements when the controller controls recording so that the data is recorded to the first structure. A second recording pulse sequence is generated based on the second requirements when the controller controls recording so that the data is recorded to the second structure. The first sequence has an (n-1)-number of recording pulses with a power corresponding to the mark length nT and additional pulses with a power that are generated for a period of the space and follow the recording pulses. The second sequence has an n/2-number of recording pulses with a corresponding to the mark length nT when 'n' is an even number whereas having an (n-1)/2-number of recording pulses with a power corresponding to the mark length nT when 'n' is an odd number. The data is recorded to the first and second structures with the light beam driven with the first and second sequences, respectively.

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First Claim