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US 7,924,519 B2Granted
Eccentricity determination for a disk
AssigneeWD Media, LLC
InventorSteven E. Lambert
Life of this patent
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Abstract
Monitoring of the eccentricity of a pre-formatted servo pattern on a disk.
Claims18
A method, comprising:
- measuring a runout of an outer diameter (OD) of a disk versus angular position with a displacement monitor in a first fixed angular position;
- decoding servo pattern information of the disk with a recording head in a second fixed angular position;
- and
- correlating the runout and the servo pattern information to determine deviation information of a center of the servo pattern from a center of the disk defined by the OD,
- wherein correlating comprises determining an eccentricity of the servo pattern on the disk based on the deviation information.
2 more elements
An apparatus, comprising:
- a spindle configured to secure and rotate a disk;
- a recording head configured to detect a first radial mark on the surface of the disk;
- a displacement monitor configured to detect a second mark on the OD edge of the disk;
- and
- a controller operatively coupled with the displacement monitor, the spindle, and the recording head to measure a runout of an outer diameter (OD) of the disk versus angular position with the displacement monitor in a first fixed angular position, the controller further configured to decode servo pattern information of the disk with the recording head in a second fixed angular position and correlate the runout and the servo pattern information to determine deviation information of a center of the servo pattern from a center of the disk defined by the OD,
- wherein correlating comprises determining an eccentricity of the servo pattern on the disk based on the deviation information.
3 more elements
Dependencies are inferred from the claim text.