Patent ID: 7945727

Claim:
A disk drive comprising: a disk comprising a plurality of refresh zones including a first refresh zone and a second refresh zone, wherein: the first refresh zone comprises a plurality of tracks including a first track; the second refresh zone comprises a plurality of tracks including a second track; and a data rate of the second track is greater than a data rate of the first track; a head actuated over the disk; and control circuitry operable to: receive access commands from a host; refresh the first refresh zone in a first plurality of segments having a first segment size, wherein the first plurality of segments are refreshed with a first interval between each segment; refresh the second refresh zone in a second plurality of segments having a second segment size, wherein the second plurality of segments are refreshed with a second interval between each segment; and process at least one of the access commands during the first and second intervals; wherein the first segment size is different from the second segment size.