| 摘要 |
In order to perform a high-speed seek of a target track while the increase of area of servo sectors is minimized, each servo sector of a disk recording medium has K (an integer of 3 or more) servo patterns. The K servo patterns consist of a first servo pattern consisting of two-phase first and second pairs of alternate pattern arrays having a period of four tracks; a second servo pattern consisting of a pair of alternate pattern arrays having a period of 2K+1 tracks and displaced by 2K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2K-k+3 (k includes all integers of not less than 3 and not more than K) tracks and displaced by 2K-k+1 tracks with respect to a (k-1)th servo pattern. K is set to 3 for a head speed of 16 tracks/sector. In this case, three servo patterns consisting of seven pattern arrays are provided. Similarly, K is set to 4 for a head speed of 32 tracks/sector. In this case, four servo patterns consisting of eight pattern arrays are provided. With such a configuration of servo patterns, the number of signal detectors for detecting servo signals corresponding to the servo pattern arrays, which are provided in a servo tracking apparatus, can be minimized. |
