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US 10,665,257 B2Granted
Parallel micro-actuator SSW writing
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsThorsten Schmidt, Gary W. Calfee, Gabor Szita, Hieu Pham
Life of this patent
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Abstract
A self servo-write process in performed on two or more recording surfaces simultaneously. In a dual-stage servo system, a first fine positioning servo system that includes a first microactuator independently controls the position of a first read/write head over a first recording surface of a hard disk drive, while a second fine positioning servo system that includes a second microactuator independently controls the position of a second read/write head over a second recording surface of the hard disk drive.
Claims6
A disk drive comprising:
- a first magnetic head and a second magnetic head;
- a first microactuator provided at an end of an actuator arm, coupled to the first magnetic head, and configured for fine positioning of the first magnetic head;
- a second microactuator provided at the end of the actuator arm, coupled to the second magnetic head, and configured for fine positioning of the second magnetic head, wherein the first microactuator is electrically coupled to a first control connection and the second microactuator is electrically coupled to a second control connection that is not electrically coupled to the first control connection;
- a voice-coil motor configured for coarse positioning of at least the first magnetic head;
- a first servo system configured to:
- position the first magnetic head over a first disk surface of a first disk with the voice-coil motor, the first microactuator, and a first servo controller that receives a first position signal from the first magnetic head and transmits a first correction signal based on the first position signal to the first microactuator;
- and
- while positioning the first magnetic head over the first disk surface, write servo information for a first track on the first disk surface with the first magnetic head;
- a second servo system configured to:
- while the first servo system positions the first magnetic head over the first disk surface, position the second magnetic head over a second disk surface of a second disk with the second microactuator, and a second servo controller that receives a second position signal from the second magnetic head and transmits a second correction signal based on the second position signal to the second microactuator;
- and
- while positioning the second magnetic head over the second disk surface, write servo information for a second track on the second disk surface with the second magnetic head;
- a first control connection bus that is electrically coupled to the first control connection and is not electrically coupled to the second control connection;
- and
- a third microactuator that is coupled to the voice-coil motor and a third magnetic head, and is electrically coupled to the first control connection bus and not to the second control connection.
12 more elements
Dependencies are inferred from the claim text.