Patent ID: 6469852
Filing Date: 2002-10-22
Classification: G11B

Abstract:
An arithmetic processing method for a servo pattern, comprising:reproducing servo patterns recorded on a disk, the disk comprising a recording surface having tracks each having a track center and having the servo patterns, the servo patterns being continuous in a radial direction and recorded at predetermined positions on the recording surface, a portion of the servo patterns formed without any signal change in the radial direction, each servo pattern including an address signal having an address value, an address identifying signal, an even number/odd number detecting signal that identifies whether a track number of the track is an even number or an odd number, and a tracking signal that is recorded differently on different sides of the track center, wherein a phase of the even number/odd number detecting signal, the address signal, and the address identifying signal change every two tracks, the phase of the even number/odd number detecting signal and the address signal changing at a first track center of the track centers in the two tracks thereby forming a boundary between the phases of the even number/odd number detecting signals, the address identifying signal changing at a second track center of the track centers in the two tracks, and an amplitude of a reproduced signal changes due to interference of neighboring signals when a magnetic head scans the first track center; determining whether there is a probability for generation of erroneous detection of the address value due to interference of neighboring different address signals at a reproducing track on the basis of a reproduced output of said even number/odd number detecting signal; and correcting the address value of erroneous detection on the basis of a reproduced output of said address identifying signal when it is determined that there is probability for said erroneous detection.