Abstract: A method of optimizing the write power for recording marks in an information layer of a record carrier by irradiating the information layer with a (pulsed) radiation beam. The method includes recording a pattern of test marks including short marks having a predetermined short nominal runlength onto the record carrier by applying at least three different write powers; measuring the runlengths of the recorded short marks obtained by applying the at least three different write powers; and determining an optimum write power based of the deviations of the measured runlengths from the nominal runlength of said short marks.

Abstract: A method of optimizing the write power for recording marks in an information layer of a record carrier by irradiating the information layer with a (pulsed) radiation beam. The method includes recording a pattern of test marks including short marks having a predetermined short nominal runlength onto the record carrier by applying at least three different write powers; measuring the runlengths of the recorded short marks obtained by applying the at least three different write powers; and determining an optimum write power based of the deviations of the measured runlengths from the nominal runlength of said short marks.

Abstract: A method and apparatus for determining the parameters for disc recording is provided. For those discs that haven't pre-stored recording information or have pre-stored recording information not meeting the quality requirement, according to the method of the present invention, set the initial values of record strategy parameters firstly, then perform disc recording test with a group of parameters that have close relevancy among each other according to the method designed in the experiment, and finally determine the relationship between each optimal parameters and the optical disc recording quality, so that optimal parameters value corresponding to each parameter can be obtained for disc recording. According to the present invention, the optimal disc recording parameters can be determined within the limited time and limited space of disc recording test.

Abstract: The present invention relates to a method of optimizing the write power for recording marks in an information layer of a record carrier by irradiating the information layer with a (pulsed) radiation beam, said information layer having a phase that is reversibly changeable between a first (for example a crystal) phase and a second (for example an amorphous) phase. Since the methods known for 1 T write strategies generally cannot be used for nT write strategies, n being an integer greater than 1, a new method is proposed comprising the steps of: recording (S 1) a pattern of test marks including short marks having a predetermined short nominal runlength onto the record carrier by applying at least three different write powers, measuring (S2) the runlengths of said recorded short marks obtained by applying the at least three different write powers, and determining (S4) an optimum write power on the basis of the deviations of the measured runlengths from the nominal runlength of said short marks.

Abstract: A method for optimizing the optical disc writing parameters, comprising the steps: acquiring the variable of a mark runlength; determining a modulation amount of the writing parameters based on a relationship between the variable of the mark runlength and the modulation amount of the writing parameters; and modulating the writing parameters. The method is applicable to multifarious optical disc systems, it can adopt multifarious strategies for the writing process, it can optimize the power or the starting time and the stopping time of a plurality of laser pulses, thereby it can get the aim of optimizing the mark runlength.

Abstract: A kind of optical disc consists of the first layer, the second layer and the in-between layer, which lies between the first layer and the second layer. The first layer with its surface undulant includes material used to record information. The second layer with its surface basically flat includes material used to record information referring to the undulation of the first layer. The method to manufacture this optical disc comprises the steps of forming undulant first layer; forming the in-between layer on the surface of the first layer; and then forming the second layer. The first layer includes material used to record information, and the second layer includes material used to record information referring to the undulation of the first layer.