| 摘要 |
<p>A rewritable disk (10), in which the length of the edit gap (18) is reduced to thereby achieve higher-density recording, as well as an apparatus for such disk, is disclosed. An area for recording a preformated encoding pattern (22) is provided on a rewritable disk (10) in order to obtain information of an eccentricity produced when the disk (10) is chucked. The information of the eccentricity produced at the time of disk chucking is detected, while the disk (10) is being driven, from a reference pulse (RP) obtained by reproduction of the encoding pattern and, on the basis of the eccentricity information, the frequency of the clock (WCK/RCK) for writing data or reading data is modulated according to eccentric positions. By so doing, it can be achieved to properly write data in sectors (16) even when the disk (10) is chucked with a certain eccentricity. Accordingly, it becomes so that only a length corresponding to several clocks is required for the edit gap (18). Thus, the ration between the area occupied by the edit gaps (18) and the area of the entire disk (10) can be reduced and thereby higher-density recording becomes achievable. <IMAGE></p> |
