| 摘要 |
<p>A magneto-optic storage media is provided with two defect information blocks (21a, 21b) storing information concerning a defect. At the time of reproduction, both the blocks are read (step S1), and it is determined whether or not reading is normal (step S2, S7). If the reading of both the blocks are normal, it is determined which of the respective numbers of registrations of the information concerning a defect in both the blocks is larger (step S25), so that the block in which the number of registrations is larger is employed (step S26, S27). Then, the defect information in the block which was not employed is updated and registered (step S32, S33). If the defect information is not registered, the block is switched (step S28), so that an updating and registering operation is executed again.</p> |
