| 摘要 |
During a write processing for channels (Ch1, Ch2, Ch3), the end limit of each channel is set according to the transfer rate varying with the ratio of the number of effective packets to that of dummy packets, and end limit information is written on a disk along with write data. In a read processing for the channel (Ch4), the end limit is set according to the end limit information which is read out of the disk along with read data. Processings of earlier end limits are carried out in order. Considering the difference between the transfer rates at the outer and inner peripheries of the disk, a write zone is determined. When simultaneous recording for the channels (Ch1, Ch2) on an ASMO of groove/land recording system is carried out, data through the channel (Ch1) are recorded along grooves and data through the channel (Ch2) are recorded along lands, sequentially.
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