Data storage device staggering access operations to facilitate concurrent access of two disk surfaces

1. A data storage device comprising:

a first disk surface;

a first head actuated over the first disk surface;

a second disk surface;

a second head actuated over the second disk surface;

a first fine actuator configured to actuate the first head over the first disk surface and a second fine actuator configured to actuate the second head over the second disk surface; and

control circuitry configured to execute a concurrent access of the first and second disk surface by at least:

accessing the first disk surface without accessing the second disk surface during a first single access interval; and

after the first single access interval, concurrently accessing the first and second disk surface during a dual access interval,

wherein the first single access interval is based on a first gain of the first fine actuator and a second gain of the second fine actuator.

2. The data storage device as recited in claim 1 , wherein after the dual access interval, the control circuitry is further configured to execute the concurrent access of the first and second disk surface by accessing the second disk surface without accessing the first disk surface during a second single access interval.

3. The data storage device as recited in claim 1 , wherein the first single access interval corresponds to a radial offset of the first and second head.

4. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to execute the concurrent access of the first and second disk surface by:

buffering first write data received from a host, wherein the first write data is mapped to the first disk surface;

buffering second write data received from the host, wherein the second write data is mapped to the second disk surface;

writing at least part of the first write data to the first disk surface during the first single access interval; and

writing at least part of the first write data to the first disk surface and concurrently writing at least part of the second write data to the second disk surface during the dual access interval.

5. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to execute the concurrent access of the first and second disk surface by:

reading first read data from the first disk surface during the first single access interval;

reading second read data from the first disk surface and concurrently reading third read data from the second disk surface during the dual access interval; and

transmitting the first, second, and third read data to a host in-order relative to an order the data was written to the first and second disk surface.

6. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to execute the concurrent access of the first and second disk surface by:

reading first read data from the first disk surface during the first single access interval;

reading second read data from the first disk surface and concurrently reading third read data from the second disk surface during the dual access interval; and

transmitting the first, second, and third read data to a host out-of-order relative to an order the data was written to the first and second disk surface.

7. The data storage device as recited in claim 1 , wherein the control circuitry is further configured to:

write consecutive data tracks of the first disk surface from an outer diameter toward a middle diameter of the first disk surface;

write consecutive data tracks of the second disk surface from an outer diameter toward a middle diameter of the second disk surface; and

access the first disk surface without accessing the second disk surface during the first single access interval when a first read element of the first head leads a second read element of the second head during the access.

8. The data storage device as recited in claim 7 , wherein the control circuitry is further configured to:

write consecutive data tracks of the first disk surface from an inner diameter toward the middle diameter of the first disk surface;

write consecutive data tracks of the second disk surface from an inner diameter toward the middle diameter of the second disk surface; and

access the second disk surface without accessing the first disk surface during a third single access interval when the second read element of the second head leads the first read element of the first head during the access.

9. A data storage device comprising:

a first disk surface comprising first servo sectors;

a first head actuated over the first disk surface;

a second disk surface comprising second servo sectors;

a second head actuated over the second disk surface; and

control circuitry configured to:

measure an offset of the first head and the second head; and

define first data tracks on the first disk surface based on the first servo sectors; and

define second data tracks on the second disk surface based on the second servo sectors and the measured offset.

10. The data storage device as recited in claim 9 , wherein the first data tracks are radially offset from the second data tracks.

11. The data storage device as recited in claim 9 , wherein the offset of the first head and the second head is based on a radial offset between a first read element of the first head and a second read element of the second head.

12. The data storage device as recited in claim 9 , wherein the offset of the first head and the second head is based on a writer/reader radial offset of the first head and a writer/reader radial offset of the second head.

13. The data storage device as recited in claim 12 , wherein the offset is based on a difference between the writer/reader radial offset of the first head and the writer/reader radial offset of the second head.

14. A data storage device comprising:

a first disk surface;

a first head actuated over the first disk surface;

a second disk surface;

a second head actuated over the second disk surface;

a means for executing a concurrent access of the first and second disk surface;

a means for measuring a radial offset of the first head and the second head; and

a means for defining first data tracks on the first disk surface and second data tracks on the second disk surface based on the measured radial offset.