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US 7,782,003 B2Granted
Positional indicia misplacement compensation
AssigneeSeagate Technology LLC
InventorThomas O. Melrose
Life of this patent
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AssigneeSeagate Technology LLC
InventorThomas O. Melrose
Estimating the term…
Apparatus and method for compensating for positional indicia misplacements in the positioning of a control object, such as with servo seam misplacements on a data storage device storage medium. An actual position for the control object is determined in relation to a corrected commanded position of the control object and a corrected position error of the control object. The corrected commanded position is determined in relation to a gain error and an actual commanded position, and the corrected position error determined in relation to the gain error and an actual position error. Preferably, an actual position error of the control object is next determined in relation to the actual position, and the control object is moved to reduce the actual position error. The positional indicia preferably comprise AB and CD seams of ABCD servo dibit patterns on a recording surface.
A method comprising using a controller circuit to determine an actual position of a control object in relation to a corrected commanded position of the control object determined responsive to a gain error, an actual commanded position, and a runout compensation value indicative of a positional error distance between an ideally located positional indicia and an actual location of positional indicia.
An apparatus comprising:
A method comprising receiving a commanded position indicative of a desired position for a control object, and then using a controller to generate a corrected commanded position in relation to the commanded position and a gain error and to move the control object to the commanded position using the corrected commanded position.
Dependencies are inferred from the claim text.