Patent ID: 7012773
Filing Date: 2006-03-14
Classification: G11B

Abstract:
1. A disk device in which a plurality of servo cylinders formed concentrically from the inner diametrical portion to the outer diametrical portion of at least one disk are divided into predetermined areas, and different servo signal frequencies are set for the divided predetermined areas, respectively, and a servo signal pattern corresponding to the servo signal frequency set for each of said areas is formed in each of said areas, and the servo signal frequency set for each of said areas is stored in advance, wherein the boundary between the area of a first servo signal frequency and the area of a second servo signal frequency adjoining the area of said first servo signal frequency is formed with an area in which a servo signal pattern written with the servo signal frequency of said first servo signal frequency area and a servo signal pattern written with said second servo signal frequency of said second servo signal frequency area are arranged on the same servo cylinders.