| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of generating an index, a method of adjusting recording condition of an information recording medium, and an information recording device which enable information to be properly recorded irrespective of recording speed without the information recording device's erroneous learning of an optimum recording power when information is recorded into a medium corresponding to high speed recording. <P>SOLUTION: An 11T single signal and a 3T single signal are recorded on a DVD-RW at the optimum recording power P1 and a recording power P2 of an intensity of 85% with relative to the optimum recording power P1, and then these signals are reproduced to calculate asymmetry values A1 and A2. If a difference (A1-A2) between both asymmetry values is equal to or greater than a reference value of 0.05, it is judged that a method using the asymmetry values is available for the OPC, and if the difference is less than a reference value of 0.05, it is judged that the method is not available. Then, the judgement result is recorded on the DVD-RW as an index. A DVD drive judges whether the asymmetry value is used for the OPC or not on the basis of the index. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
