Disk drive servo writing using stylus to sense vibration between an actuator arm and a servo writer push-arm
First Claim
1. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
- moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk;
writing servo fields through the head along an arc at the defined radial location on the disk; and
generating an electrical vibration signal with a stylus sensor connected to the push-arm and having a stylus member that contacts and is biased against the actuator arm when the push-arm contacts the actuator arm, wherein the electrical vibration signal is indicative of vibration between the stylus member and the push-arm.
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Accused Products
Abstract
Embodiments of the present invention are directed to methods of making a disk drive and related servo writers. The disk drive includes a data storage disk, an actuator arm, and a head connected to the actuator arm. The disk drive is connected to a servo writer that includes a push-arm that is configured to radially move the actuator arm relative to the disk. The method includes moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk. Servo fields are written through the head along an arc at the defined radial location on the disk. A sensor that contacts the actuator arm is used to generate an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm.
15 Citations
30 Claims
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1. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; and generating an electrical vibration signal with a stylus sensor connected to the push-arm and having a stylus member that contacts and is biased against the actuator arm when the push-arm contacts the actuator arm, wherein the electrical vibration signal is indicative of vibration between the stylus member and the push-arm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; generating from a sensor that contacts the actuator arm an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and controlling movement of the push-arm responsive to the vibration signal to reduce vibration between the actuator arm and the push-arm. - View Dependent Claims (10)
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11. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; generating from a sensor that contacts the actuator arm an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and controlling an actuator motor, which radially positions the actuator arm relative to the disk, to vary bias force of the actuator arm against the push-arm responsive to the vibration signal. - View Dependent Claims (12)
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13. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; generating from a sensor that contacts the actuator arm an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and logging a series of samples of the vibration signal while servo fields are written through the head on the disk.
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14. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; generating from a sensor that contacts the actuator arm an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and initiating at least a partial rewrite of servo fields on the disk responsive to the vibration signal indicating more than a threshold amount of vibration.
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15. A method of making a disk drive, wherein the disk drive comprises a data storage disk, an actuator arm, and a head connected to the actuator arm, and the disk drive is connected to a servo writer that comprises a push-arm configured to move the actuator arm radially relative to the disk, the method comprising:
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moving the push-arm of the servo writer a defined distance to push the actuator arm and position the head at a defined radial location on the disk; writing servo fields through the head along an arc at the defined radial location on the disk; generating from a sensor that contacts the actuator arm an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and using the electrical vibration signal generated by the sensor to select a material with a known damping characteristic for use in the servo writer. - View Dependent Claims (16)
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17. A servo writer configured to write servo fields in a disk drive, the disk drive comprising a data storage disk, an actuator arm, and a head connected to the actuator arm, the servo writer comprising:
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a push-arm that is configured to radially move the actuator arm relative to the disk; a positioner that is configured to move the push-arm a defined distance to push the actuator arm and position the head at a defined radial location on the disk; a sensor that is configured to contact the actuator arm and to generate an electrical vibration signal that is indicative of vibration between the push-arm and the actuator arm; and a control unit that is configured to write servo fields through the head along an arc at the defined radial location on the disk while the sensor is generating the vibration signal indicative of relative vibration between the push-arm and the actuator arm. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification