Magnetic Spacing Map Method and Apparatus for a Disk Drive
OwnerCharles Parteeinventor
Life of this patent
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Abstract
An exemplary embodiment providing one or more improvements includes a head apparatus clearance control apparatus and method in which a map of disk drive disk is created and used for adjusting the head clearance of a disk drive.
Claims37
In a disk drive having a disk that is supported for rotation and having at least one major surface which defines an annular major surface area, and a head arrangement supported for movement relative to the major surface area for use in performing one or both of a write operation to write data to the disk and a read operation to access data from the disk, in cooperation with the rotation of the disk for any given radius of the disk on the major surface area, the head arrangement having a clearance from the major surface area that is selectively controllable, a method comprising:
- creating a map including a location of at least one point on the major surface area of the disk, where the location of the point is characterizable by a radius and a circumference location;
- and
- using the map, adjusting the head arrangement clearance as the point approaches the head arrangement on said radius with rotation of the disk.
A disk drive having a disk that is supported for rotation and having at least one major surface which defines an annular major surface area, and a head arrangement supported for movement relative to the major surface area for use in performing one or both of a write operation to write data to the disk and a read operation to access data from the disk, in cooperation with the rotation of the disk for any given radius of the disk on the major surface area, the head arrangement having a clearance from the major surface area that is selectively controllable, a controller comprising:
- a map generator for generating a map that includes a location of at least one point on the major surface area of the disk, where the map includes a radius and circumferential location of the point;
- a memory device for storing the map;
- and
- a head clearance control portion for using the map to adjust the head arrangement clearance as the point approaches the head arrangement with rotation of the disk on said radius.
In a disk drive having a disk that is supported for rotation and having at least one major surface which defines an annular major surface area, and a head arrangement supported for movement relative to the major surface area for use in performing one or both of a write operation to write data to the disk and a read operation to access data from the disk, in cooperation with the rotation of the disk for any given radius of the disk on the major surface area, at a head arrangement clearance from the major surface area that is selectively controllable, a method comprising:
- creating a map of the major surface area of the disk including at least a first dimension and a second dimension to uniquely identify any given point on said major surface area;
- correlating at least one item of information against said map such that the item of information can have a unique value for the given point on said map in relation to said major surface area;
- and
- adjusting said head arrangement clearance, based on said map, as the given point approaches the head arrangement with rotation of the disk.
In a disk drive having a disk that is supported for rotation and having at least one major surface which defines an annular major surface area, and a head arrangement supported for movement relative to the major surface area for use in performing one or both of a write operation to write data to the disk and a read operation to access data from the disk, in cooperation with the rotation of the disk for any given radius of the disk on the major surface area, at a head arrangement clearance that is selectively controllable using a clearance setting of the head arrangement, a method comprising:
- creating a two dimensional map of the major surface area of the disk, based on at least one characteristic of the disk;
- and
- circumferentially adjusting said clearance setting, based on said two dimensional map and said characteristic, for the given radius of the disk as said disk spins in relation to the head arrangement at the given radius.
Dependencies are inferred from the claim text.