Disk drive generating feed-forward actuator compensation based on a speaker driver signal

• US 8,634,158 B1
• Filed: 11/16/2011
• Issued: 01/21/2014
• Est. Priority Date: 11/16/2011
• Status: Active Grant

• Current Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Original Assignee: Western Digital Technologies Incorporated (Western Digital Corporation)
• Inventors: Flynn, William, Chahwan, Alain
• Primary Examiner(s): HUBER, PAUL W
• Application Number:
  US13/298,170
• Time in Patent Office: 797 Days
• Field of Search: None
• US Class Current: 360/75
• CPC Class Codes: G11B 19/042 due to external shock or vibration
• CPC Class Codes: G11B 5/5582 system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock
• CPC Class Codes: G11B 5/59694 System adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock

Abstract

A disk drive is disclosed comprising a disk, a head, an actuator for actuating the head over the disk, and control circuitry comprising a servo control system for controlling the actuator. A compensation value is generated based on a speaker driver signal, and the actuator is controlled using the compensation value.

Claims

1. A disk drive comprising:

a disk;

a head;

an actuator for actuating the head over the disk; and

control circuitry comprising a servo control system for controlling the actuator, the control circuitry operable to;

generate a compensation value based on a speaker driver signal; and

control the actuator using the compensation value.

2. The disk drive as recited in claim 1, wherein the actuator is operable to actuate the head radially over the disk.

3. The disk drive as recited in claim 1, further comprising an interface operable to receive the speaker driver signal from a host.

4. The disk drive as recited in claim 3, wherein the speaker driver signal comprises an analog signal.

5. The disk drive as recited in claim 4, wherein the control circuitry is further operable to:

sample the analog signal to generate a digital signal; and

generate the compensation value in response to the digital signal.

6. The disk drive as recited in claim 3, wherein the speaker driver signal comprises a digital signal.

7. The disk drive as recited in claim 6, wherein the host converts the digital signal into an analog signal for driving a speaker.

8. The disk drive as recited in claim 1, wherein the compensation value comprises a feed-forward compensation value.

9. The disk drive as recited in claim 8, wherein the control circuitry further comprises a feed-forward generator operable to generate the feed-forward compensation value, the control circuitry further operable to:

generate a position error signal (PES) representing a difference between a measured position of the head and a reference position; and

adapt the feed-forward generator based on the speaker driver signal and the PES.

10. The disk drive as recited in claim 9, wherein the control circuitry is further operable to adapt the feed-forward generator during a calibration procedure when the speaker driver signal comprises a predetermined signal.

11. A method of operating a disk drive comprising a disk, a head, and an actuator for actuating the head over the disk, the method comprising:

generating a compensation value based on a speaker driver signal; and

controlling the actuator using the compensation value.

12. The method as recited in claim 11, wherein the actuator is operable to actuate the head radially over the disk.

13. The method as recited in claim 12, further comprising receiving the speaker driver signal from a host.

14. The method as recited in claim 13, wherein the speaker driver signal comprises an analog signal.

15. The method as recited in claim 14, further comprising:

sampling the analog signal to generate a digital signal; and

generating the compensation value in response to the digital signal.

16. The method as recited in claim 13, wherein the speaker driver signal comprises a digital signal.

17. The method as recited in claim 16, wherein the host converts the digital signal into an analog signal for driving a speaker.

18. The method as recited in claim 11, wherein the compensation value comprises a feed-forward compensation value.

19. The method as recited in claim 18, further comprising:

generating a position error signal (PES) representing a difference between a measured position of the head and a reference position; and

adapting a feed-forward generator based on the speaker driver signal and the PES.

20. The method as recited in claim 19, further comprising adapting the feed-forward generator during a calibration procedure when the speaker driver signal comprises a predetermined signal.