Granted Patent B1

US 9,053,724 · App. 14/023,776 · Granted Jun 9, 2015

Abstract

Claims (80)

1. A disk drive comprising:

a first disk surface, a second disk surface, and a third disk surface;

a first head operable to be positioned over the first disk surface;

a second head operable to be positioned over the second disk surface;

a third head operable to be positioned over the third disk surface;

a first microactuator operable to actuate the first head;

a second microactuator operable to actuate the second head;

a third microactuator operable to actuate the third head over the third disk surface; and

control circuitry operable to:

actuate the first head over the first disk surface using the first microactuator while processing a second sensor signal generated by the second microactuator and while processing a third sensor signal generated by the third microactuator;

write data to the first disk surface while actuating the first head over the first disk surface; and

abort the write based on the second sensor signal and the third sensor signal.

2. The disk drive as recited in claim 1 , wherein the control circuitry is further operable to:

generate a feed-forward compensation value based on the second sensor signal and the third sensor signal; and

actuate the first head over the first disk surface based on the feed-forward compensation value.

3. The disk drive as recited in claim 1 , wherein the control circuitry is further operable to:

adapt at least one of a VCM compensator and a microactuator compensator based on the second sensor signal and the third sensor signal; and

actuate the first head over the first disk surface based on a feedback control signal generated by at least one of the VCM compensator and the microactuator compensator.

4. The disk drive as recited in claim 1 , wherein:

the first head is coupled to a first actuator arm; and

the second head is coupled to the first actuator arm.

5. The disk drive as recited in claim 1 , wherein:

the first head is coupled to a first actuator arm; and

the second head is coupled to a second actuator arm.

6. A method of operating a disk drive comprising:

actuating a first head over a first disk surface using a first microactuator while processing a second sensor signal generated by a second microactuator and while processing a third sensor signal generated by a third microactuator;

writing data to the first disk surface while actuating the first head over the first disk surface; and

aborting the write based on the second sensor signal and the third sensor signal.

7. The method as recited in claim 6 , further comprising:

generating a feed-forward compensation value based on the second sensor signal and the third sensor signal; and

actuating the first head over the first disk surface based on the feed-forward compensation value.

8. The method as recited in claim 6 , further comprising:

adapting at least one of a VCM compensator and a microactuator compensator based on the second sensor signal and the third sensor signal; and

actuating the first head over the first disk surface based on a feedback control signal generated by at least one of the VCM compensator and the microactuator compensator.

9. The method as recited in claim 6 , further comprising actuating a second head over a second disk surface using the second microactuator, wherein:

the first head is coupled to a first actuator arm; and

the second head is coupled to the first actuator arm.

10. The method as recited in claim 6 , further comprising actuating a second head over a second disk surface using the second microactuator, wherein:

the first head is coupled to a first actuator arm; and

the second head is coupled to a second actuator arm.

11. A disk drive comprising:

a first disk surface and a second disk surface;

a first head operable to be positioned over the first disk surface;

a second head operable to be positioned over the second disk surface;

a first microactuator operable to actuate the first head;

a second microactuator operable to actuate the second head; and

control circuitry operable to:

actuate the first head over the first disk surface using the first microactuator while processing a sensor signal generated by the second microactuator;

adapt at least one of a VCM compensator and a microactuator compensator based on the sensor signal; and

actuate the first head over the first disk surface based on a feedback control signal generated by at least one of the VCM compensator and the microactuator compensator.

12. A disk drive comprising:

a first disk surface, a second disk surface, and a third disk surface;

a first head operable to be positioned over the first disk surface;

a second head operable to be positioned over the second disk surface;

a third head operable to be positioned over the third disk surface;

a first microactuator operable to actuate the first head;

a second microactuator operable to actuate the second head;

a third microactuator operable to actuate the third head over the third disk surface; and

control circuitry operable to actuate the first head over the first disk surface using the first microactuator while applying a control signal to the third microactuator based on a sensor signal generated by the second microactuator.

13. A method of operating a disk drive, the method comprising:

actuating a first head over a first disk surface using a first microactuator while processing a sensor signal generated by a second microactuator;

adapting at least one of a VCM compensator and a microactuator compensator based on the sensor signal; and

actuating the first head over the first disk surface based on a feedback control signal generated by at least one of the VCM compensator and the microactuator compensator.

14. A method of operating a disk drive, the method comprising actuating a first head over a first disk surface using a first microactuator while applying a control signal to a third microactuator based on a sensor signal generated by a second microactuator.

15. A disk drive comprising:

a first disk surface, a second disk surface, and a third disk surface;

a first head operable to be positioned over the first disk surface;

a second head operable to be positioned over the second disk surface;

a third head operable to be positioned over the third disk surface;

a first microactuator operable to actuate the first head;

a second microactuator operable to actuate the second head;

a third microactuator operable to actuate the third head over the third disk surface; and

control circuitry operable to:

actuate the first head over the first disk surface using the first microactuator while processing a second sensor signal generated by the second microactuator and while processing a third sensor signal generated by the third microactuator;

generate a feed-forward compensation value based on the second sensor signal and the third sensor signal; and

actuate the first head over the first disk surface based on the feed-forward compensation value.

16. A method of operating a disk drive comprising:

actuating a first head over a first disk surface using a first microactuator while processing a second sensor signal generated by a second microactuator and while processing a third sensor signal generated by a third microactuator;

generating a feed-forward compensation value based on the second sensor signal and the third sensor signal; and

actuating the first head over the first disk surface based on the feed-forward compensation value.

Assignments (7)