1. Adhesive for optical disk and optical disk

2. Optical disk drives

3. Adhesive composition and optical disk using the composition

4. In a known optical disk, the data tracks are wobbled about a mean frequency.

5. The present disclosure actively decouples the control loops using a software algorithm to provide better performing optical disk drives.

6. The abrasive compound is suitable for polishing the surface of a glass substrate for an optical disk platter and a magnetic disk platter.

7. A method for machining a master optical disk which has a physical format and in which a rewritable optical disk constituted of a groove and pre-bit groups records a pre-bit group which is not on the same spiral as that of the groove by shifting the pre-bit group inward by, for example, a 1/2 track pitch from the center of the groove, which method comprises installing a light deflector utilizing an acoustooptic effect or another light deflector (101) utilizing an electrooptic effect on the optical path of a mastering device, thus deflecting one laser beam.