Patent ID: 7706091

Claim:
A disk device comprising: a disk medium having a recording area divided by zone boundaries in the radial direction into a plurality of zones for each of which a recording frequency is set individually; and a first head and a second head which are provided correspondingly to each recording surface of a plurality of recording surfaces present in said disk medium and serving to conduct reading or writing of data from or on said disk medium, wherein the recording area is expanded, and a recording angular density in each zone is shifted toward the recording angular density in the inner zone, so that the highest recording frequency on the recording surface corresponding to said first head is lower than the highest recording frequency on the recording surface corresponding to said second head, and the recording frequency in an n-th zone (n is a natural number) from the innermost peripheral side of the recording surface corresponding to said first head is equal to the recording frequency of an (n−1)-th zone from the innermost peripheral side of the recording surface corresponding to said second head.