Calibrating elevator actuator for disk drive
A data storage device is disclosed wherein an elevator actuator is controlled to move a head along an axial dimension toward a first disk surface of a first disk while processing a proximity signal generated by a proximity sensor. A first actuator position is detected when the actuator arm is proximate the first disk surface of the first disk based on the proximity signal.
1. A data storage device comprising:
a first disk comprising a first disk surface and a second disk surface;
a second disk comprising a first disk surface and a second disk surface;
an actuator arm comprising a proximity sensor;
a head coupled to a distal end of the actuator arm;
an elevator actuator configured to actuate the head along an axial dimension relative to the first and second disks;
a radial actuator configured to actuate the head radially relative to the first and second disks; and
control circuitry configured to:
control the elevator actuator to move the head along the axial dimension toward the first disk surface of the first disk and process a proximity signal generated by the proximity sensor;
detect a first actuator position when the actuator arm is proximate the first disk surface of the first disk based on the proximity signal;
control the elevator actuator to further move the head along the axial dimension toward the second disk surface of the first disk;
detect a second actuator position when the actuator arm is proximate the second disk surface of the first disk based on the proximity signal; and
average the first actuator position and the second actuator position to generate a first load position.
2. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to:
control the elevator actuator to move the head along the axial dimension toward the first disk surface of the second disk; and
detect a third actuator position when the actuator arm is proximate the first disk surface of the second disk based on the proximity signal.
3. The data storage device as recited in claim 2 , wherein the control circuitry is further configured to:
control the elevator actuator to move the head along the axial dimension toward the second disk surface of the second disk; and
detect a fourth actuator position when the actuator arm is proximate the second disk surface of the second disk based on the proximity signal.
4. The data storage device as recited in claim 3 , wherein the control circuitry is further configured to
average the third actuator position and the fourth actuator position to generate a second load position.
5. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to:
move the elevator actuator to the first load position; and
control the radial actuator to load the head over the first disk surface of the first disk.
6. The data storage device as recited in claim 1 , wherein the proximity signal comprises a proximity signal A, a proximity signal B, and a proximity signal C, each generated by one of three sensors distributed along the axial dimension.
7. The data storage device as recited in claim 6 , wherein the control circuitry is further configured to detect the first load position when:
proximity signal B is above a threshold; and
proximity signal A is substantially equal to proximity signal C.
8. The data storage device as recited in claim 6 , wherein the control circuitry is further configured to detect the first load position based on:
P
o
s
m
i
d
A
+
P
o
s
m
i
d
C
2
+
P
o
s
m
i
d
B
2
.
9. The data storage device as recited in claim 8 , wherein the control circuitry is further configured to update the first load position when moving the actuator arm up toward the first disk surface of the first disk based on:
δ
A
u
p
+
δ
B
u
p
+
δ
C
u
p
3
.
10. The data storage device as recited in claim 8 , wherein the control circuitry is further configured to update the first load position when moving the actuator arm down toward the second disk surface of the first disk based on:
δ
A
down
+
δ
B
down
+
δ
C
down
3
.
11. The data storage device as recited in claim 8 , wherein the control circuitry is further configured to:
move the elevator actuator to the first load position; and
control the radial actuator to load the head over the first disk surface of the first disk.
12. A data storage device comprising:
a first disk comprising a first disk surface and a second disk surface;
a second disk comprising a first disk surface and a second disk surface;
an actuator arm comprising a proximity sensor configured to generate a proximity signal A generated by a sensor A, a proximity signal B generated by a sensor B, and a proximity signal C generated by a sensor C;
a head coupled to a distal end of the actuator arm;
an elevator actuator configured to actuate the head along an axial dimension relative to the first and second disks;
a radial actuator configured to actuate the head radially relative to the first and second disks; and
control circuitry configured to:
detect a load position of the actuator arm based on the proximity signal A, the proximity signal B, and the proximity signal C;
control the elevator actuator to move the actuator arm to the load position;
control the radial actuator to load the head over the first disk surface of the first disk,
wherein:
the sensor A, the sensor B and the sensor C are distributed along the axial dimension; and
the control circuitry is further configured to detect the load position when the proximity signal B is above a threshold and the proximity signal A is substantially equal to the proximity signal C.
13. The data storage device as recited in claim 12 , wherein the control circuitry is further configured to detect the load position based on:
Pos
midA
+
Pos
midC
2
+
Pos
midB
2
.
14. The data storage device as recited in claim 13 , wherein the control circuitry is further configured to update the load position when moving the actuator arm up toward the first disk surface of the first disk based on:
δ
A
up
+
δ
B
up
+
δ
C
up
3
.
15. The data storage device as recited in claim 13 , wherein the control circuitry is further configured to update the load position when moving the actuator arm down toward the second disk surface of the first disk based on:
δ
A
down
+
δ
B
down
+
δ
C
down
3
.
16. A data storage device comprising:
a first disk comprising a first disk surface and a second disk surface;
a second disk comprising a first disk surface and a second disk surface;
an actuator arm comprising a proximity sensor;
a head coupled to a distal end of the actuator arm;
an elevator actuator configured to actuate the head along an axial dimension relative to the first and second disks;
a radial actuator configured to actuate the head radially relative to the first and second disks; and
a means for detecting a load position of the actuator arm relative to the first disk based on the proximity sensor by:
controlling the elevator actuator to move the head along the axial dimension toward the first disk surface of the first disk and process a proximity signal generated by the proximity sensor;
detecting a first actuator position when the actuator arm is proximate the first disk surface of the first disk based on the proximity signal;
controlling the elevator actuator to further move the head along the axial dimension toward the second disk surface of the first disk;
detecting a second actuator position when the actuator arm is proximate the second disk surface of the first disk based on the proximity signal; and
averaging the first actuator position and the second actuator position to generate the load position.
17. The data storage device as recited in claim 16 , further comprising:
a means for controlling the elevator actuator to move the actuator arm to the load position; and
a means for controlling the radial actuator to load the head over the first disk surface of the first disk.
18. A data storage device comprising:
a first disk comprising a first disk surface and a second disk surface;
a second disk comprising a first disk surface and a second disk surface;
an actuator arm comprising a proximity sensor configured to generate a proximity signal A generated by a sensor A, a proximity signal B generated by a sensor B, and a proximity signal C generated by a sensor C;
a head coupled to a distal end of the actuator arm;
an elevator actuator configured to actuate the head along an axial dimension relative to the first and second disks;
a radial actuator configured to actuate the head radially relative to the first and second disks; and
control circuitry configured to:
detect a load position of the actuator arm based on the proximity signal A, the proximity signal B, and the proximity signal C by computing:
Pos
midA
+
Pos
midC
2
+
Pos
midB
2
control the elevator actuator to move the actuator arm to the load position; and
control the radial actuator to load the head over the first disk surface of the first disk.
19. The data storage device as recited in claim 18 , wherein the control circuitry is further configured to update the load position when moving the actuator arm up toward the first disk surface of the first disk based on:
δ
A
up
+
δ
B
up
+
δ
C
up
3
.
20. The data storage device as recited in claim 18 , wherein the control circuitry is further configured to update the load position when moving the actuator arm down toward the second disk surface of the first disk based on:
δ
A
down
+
δ
B
down
+
δ
C
down
3
.