| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical information recording medium contents of which are reproduced by a recording device and a reproducing device of the conventional low-speed specifications, and deals with high-speed recording disabled with the recording device of the low-speed specifications. <P>SOLUTION: In the optical information recording medium which has an address t every sector, records information by light irradiation, and also has at least one discontinuous part of address t to physical arrangement of the sectors in a region A which begins at a start address t1, and a recording device accesses only at the time of recording operation, the modulation degree when the longest mark for the optical information recording medium is recorded at a recording speed of V=0.5 Vmin with respect to the assured minimum recording speed Vmin of the optical information recording medium is so determined as to be below the minimum regulated value of the optical information recording medium. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
