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US 7,804,661 B2Granted
Microactuator control that avoids thermal asperities on disk surfaces
AssigneeSeagate Technology LLC
InventorsLawrence Allen Wilcox, Andrew Robert Motzko
Life of this patent
Estimating the term…
Abstract
While a microactuator is controlled to cause a head to follow a track on a disk surface, one or more other microactuators are separately controlled to offset other heads away from locations of thermal asperities on other associated disk surfaces.
Claims19
A circuit comprising:
- a controller that controls a first microactuator to cause a first head to follow a track on a first disk surface while controlling a second microactuator to conditionally and radially offset a second head away from a track on a second disk surface responsive to data that identifies locations of thermal asperities on the second disk surface.
A circuit comprising:
- a memory for storing thermal asperity data that identifies sectors of tracks on a disk surface that contain thermal asperities;
- and
- a controller that responds to the thermal asperity data by controlling a microactuator to conditionally and radially offset a head away from the identified sectors of tracks to avoid contact between the head and the thermal asperities.
A method comprising:
- controlling a first microactuator to cause a first head to follow a track on a first disk surface;
- and
- simultaneously controlling a second microactuator to conditionally and radially offset a second head away from a track on a second disk surface responsive to data that identifies locations of thermal asperities on the second disk surface.
Dependencies are inferred from the claim text.