Patent ID: 7102840
Filing Date: 2006-09-05
Classification: G11B

Abstract:
1. A disc apparatus comprising: a disc as a recording medium; a recording element which records information on the disc; and a read element which reads the information recorded on the disc, wherein the disc includes: a first servo pattern formed of burst patterns and written so as to have predetermined repetition patterns in a radial direction; and a second servo pattern having a first repetition pattern portion and a second repetition pattern portion that are alternately arranged in the radial direction, the first repetition pattern portion having same repetition patterns as the repetition patterns of the first servo pattern and written at a position deviated in the radial direction from the first servo pattern by approximately one fourth of a width in the radial direction of the burst pattern, and the second repetition pattern portion having same repetition patterns as the repetition patterns of the first servo pattern and written at a position with substantially no deviation in the radial direction from the first servo pattern.