Disk drive connecting defect shapes to preempt data loss
AssigneeWestern Digital Technologies, Inc.
InventorsDody Suratman, Chirag C. Patel, Chun Sei Tsai
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Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A first defect shape is detected during a manufacturing defect scan of the disk. A second defect shape is detected while the disk drive is deployed in-the-field. Whether the first defect shape is connectable to the second defect shape is determined, and when the first defect shape is connectable to the second defect shape, data sectors along a trajectory between the first defect shape and the second defect shape are relocated.
Claims20
A disk drive comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk;
- and
- control circuitry operable to;
- detect a first defect shape during a manufacturing defect scan of the disk;
- detect a second defect shape while the disk drive is deployed in-the-field;
- determine whether the first defect shape is connectable to the second defect shape;
- and
- when the first defect shape is connectable to the second defect shape, relocate data sectors along a trajectory between the first defect shape and the second defect shape,
- wherein the control circuitry is further operable to detect a spiral shape defect associated with one of loading the head off a ramp and unloading the head onto the ramp.
A method of operating a disk drive, the disk drive comprising a head actuated over a disk comprising a plurality of data tracks, the method comprising:
- detecting a first defect shape during a manufacturing defect scan of the disk;
- detecting a second defect shape while the disk drive is deployed in-the-field;
- determining whether the first defect shape is connectable to the second defect shape;
- and
- when the first defect shape is connectable to the second defect shape, relocating data sectors along a trajectory between the first defect shape and the second defect shape,
- the method further comprising detecting a spiral shape defect associated with one of loading the head off a ramp and unloading the head onto the ramp.
A disk drive comprising:
- a disk comprising a plurality of data tracks;
- a head actuated over the disk;
- and
- control circuitry operable to;
- detect a first defect shape during a manufacturing defect scan of the disk;
- detect a second defect shape while the disk drive is deployed in-the-field;
- determine whether the first defect shape is connectable to the second defect shape;
- and
- when the first defect shape is connectable to the second defect shape, relocate data sectors along a trajectory between the first defect shape and the second defect shape,
- wherein the control circuitry is further operable to:
- detect a first center of the first defect shape;
- detect a second center of the second defect shape;
- and
- determine that the first defect shape is connectable to the second defect shape when the first center substantially matches the second center.
A method of operating a disk drive, the disk drive comprising a head actuated over a disk comprising a plurality of data tracks, the method comprising:
- detecting a first defect shape during a manufacturing defect scan of the disk;
- detecting a second defect shape while the disk drive is deployed in-the-field;
- determining whether the first defect shape is connectable to the second defect shape;
- and
- when the first defect shape is connectable to the second defect shape, relocating data sectors along a trajectory between the first defect shape and the second defect shape,
- the method further comprising:
- detecting a first center of the first defect shape;
- detecting a second center of the second defect shape;
- and
- determining that the first defect shape is connectable to the second defect shape when the first center substantially matches the second center.
Dependencies are inferred from the claim text.