Patent ID: 7317587
Filing Date: 2008-01-08
Classification: G11B

Abstract:
1. A disk device comprising: a disk medium having set therein a recording area divided by zone boundaries into a plurality of zones in the radial direction; a head moving over said disk medium and reading or writing data from or on said disk medium; and a controller measuring an inner recording boundary and an outer recording boundary indicating recording boundaries of said head, wherein, when the movability range of said head which is an area surrounded by said inner recording boundary and said outer recording boundary is wider than said set recording area, the recording area in said disk medium is expanded and new zone boundaries are set, and wherein the recording frequency of the outer peripheral zone is equal to or higher than the recording frequency of the inner peripheral zone, and when the movability range of said head is wider on the inner peripheral side than said set recording area, said zone boundaries are shifted to the outer peripheral side.