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System for detecting the position of a read-write head on a disk recording medium having servo sectors with three or more servo patterns
| Details |
Inventors: Sugaya, Toshihiro;
Assignee: Tokyo Shibaura Denki Kabushiki Kaisha (Kawasaki, JP)
Primary Examiner: Cardillo; Raymond F.
Assistant Examiner: Garland; Steven R.
Attorney, Agent or Firm: Oblon, Fisher, Spivak, McClelland, Maier
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 2.sup.K+1 tracks and displaced by 2.sup.K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2.sup.K-k+3 (k includes all integers of not less than 3 and not more than K) tracks and displaced by 2.sup.K-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. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a disk recording medium of the embedded servo-system suitable for high-speed seek operation with a minimized increase of servo sector regions.
It is another object of the present invention to provide a head position-detecting system using an embedded servo system capable of performing a high-speed seek of a target track.
According to the present invention, in a disk recording medium having a plurality of data sectors each having concentric data tracks, and servo sectors each having concentric servo tracks and embedded between two adjacent data sectors, each of the servo sectors has K (an integer of not less than 3) servo patterns which consist of a first servo pattern consisting of a first pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, and a second pair of alternate pattern arrays having a period of four tracks and arranged in a staggered fashion, the first and second pairs of alternate pattern arrays being displaced by one track with respect to each other; a second servo pattern consisting of a pair of alternate pattern arrays each having a period of 2.
sup.
K+1 tracks and displaced by 2.
sup.
K-1 tracks with respect to each other; and a kth servo pattern consisting of an alternate pattern array having a period of 2.
sup.
K-k+3 (k includes all integers of not less than 3 and not more than K) tracks and displaced by 2.
sup.
K-k+1 tracks with respect to the (k-1)th servo pattern.
In a high-speed seek, the head speed of not more than 16 tracks/sector or 32 tracks/sector is practical.
Both K and k are set to 3 for the head speed of not more than 16 tracks/sector.
Therefore, in this case, three types of servo patterns are formed in the servo sector.
The second servo pattern consisting of a pair of alternate pattern arrays having a period of 16 tracks and displaced by four tracks with respect to each other.
The third servo pattern consists of an alternate pattern array having a period of eight tracks and displaced by two tracks with respect to the second servo pattern
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