Patent ID: 8089720
Filing Date: 2012-01-03
Classification: B82Y,G11B

Abstract:
1. A hard-disk drive comprising: a magnetic-recording disk in which tracks adjacent to each other are magnetically separated in advance; a spindle motor which drives said magnetic-recording disk; a magnetic-recording head equipped with a write element and a read element; an actuator for positioning said magnetic-recording head on a predetermined track on said magnetic-recording disk; and a control unit; wherein said control unit is configured to store information about an over-write-only track that is provided for a plurality of tracks including n consecutive tracks in at least a partial radial area of said magnetic-recording disk and that is not dedicated for the magnetic recording of data, and an offset amount; and wherein, in a radial area of the magnetic disk where said over-write-only track is located, said control unit is configured to record with an offset by an offset amount from a center of a track toward said over-write-only track with respect to n−1 tracks of said plurality of n tracks, excluding said over-write-only track, wherein a substantially defective track confirmed separately by another unit is configured as said over-write-only track.