| 摘要 |
A read signal for one revolution of each of a plurality of tracks jitter of which is cancelled is obtained and a binary-coded image data for the read signal is generated and the track number position of each servo area is specified from the binary-coded image data. Further, a read signal in this position in radial direction is obtained from the track number position of each of the specified servo areas and the servo area is tested by the read signal. |
