Methods for reading data from a storage medium using a reader and storage devices

1. A method for reading data from a storage medium using a reader, wherein the reader comprises at least one reader head, the method comprising:

reading a first signal with a reader head of the reader at a pre-determined position of the storage medium, wherein the storage medium comprises a plurality of tracks written using shingled magnetic recording;

reading a second signal with a reader head of the reader at the pre-determined position of the storage medium;

determining a trigger signal directly from a readback signal from the storage medium, wherein the trigger signal is a pre-written low-frequency signal at a beginning of a data track, which includes the pre-determined position; and

determining a mechanical jitter free signal based on the trigger signal; and

determining data stored at the pre-determined position of the storage medium based on (i) an average of the first signal and the second signal, (ii) and the mechanical jitter free signal.

2. The method of claim 1 , further comprising:

reading a plurality of signals, wherein for each signal a reader head of the reader is at the pre-determined position of the storage medium; and

determining the data stored at the pre-determined position of the storage medium based on the plurality of signals.

3. The method of claim 1 , wherein the storage medium comprises a dedicated servo layer.

4. The method of claim 1 , further comprising:

determining a spindle index; and

determining the data stored at the pre-determined position of the storage medium further based on the determined spindle index.

5. The method of claim 1 , further comprising:

determining a sector identifier index; and

determining the data stored at the pre-determined position of the storage medium further based on the determined sector identifier index.

6. The method of claim 1 , further comprising:

eliminating mechanical induced jitter noise; and

determining the data stored at the pre-determined position of the storage medium based on the first signal and based on the second signal after the jitter noise has been eliminated.

7. The method of claim 6 , wherein eliminating the jitter noise comprises determining a low frequency bit on a beginning of a data track which includes the pre-determined position.

8. The method of claim 6 , wherein eliminating the mechanical induced jitter noise comprises determining a synchronization signal from a dedicated servo layer.

9. A storage device comprising:

a storage medium comprising a plurality of tracks written using shingled magnetic recording;

a reader comprising at least one reader head, the reader configured to read a first signal with a reader head of the reader at a pre-determined position of the storage medium and configured to read a second signal with a reader head of the reader at the pre-determined position of the storage medium; and

a data determination circuit configured to:

determine a trigger signal directly from a readback signal from the storage medium, wherein the trigger signal is a pre-written low-frequency signal at a beginning of a data track, which includes the pre-determined position;

determine the mechanical jitter free signal based on the trigger signal; and

determine data stored at the pre-determined position of the storage medium based on (i) an average of the first signal and the second signal and further based on (ii) the mechanical jitter free signal.

10. The storage device of claim 9 , wherein:

the reader is further configured to read a plurality of signals, wherein for each signal a reader head of the reader is at the pre-determined position of the storage medium; and

the data determination circuit is further configured to determine the data stored at the pre-determined position of the storage medium based on the plurality of signals.

11. The storage device of claim 9 , wherein the storage medium comprises a dedicated servo layer.

12. The storage device of claim 9 , further comprising:

a spindle index determination circuit configured to determine a spindle index; and

wherein the data determination circuit is further configured to determine the data stored at the pre-determined position of the storage medium further based on the determined spindle index.

13. The storage device of claim 9 , further comprising:

a sector identifier index determination circuit configured to determine a sector identifier index;

wherein the data determination circuit is further configured to determine the data stored at the pre-determined position of the storage medium further based on the determined sector identifier index.

14. The storage device of claim 9 , further comprising:

a jitter noise elimination circuit configured to eliminate mechanical induced jitter noise;

wherein the data determination circuit is further configured to determine the data stored at the pre-determined position of the storage medium based on the first signal and based on the second signal after the jitter noise has been eliminated.

15. The storage device of claim 14 , wherein the jitter noise elimination circuit is configured to eliminate the mechanical induced jitter noise using determining a low frequency bit on a beginning of a data track which includes the pre-determined position.

16. The storage device of claim 14 , wherein the jitter noise elimination circuit is configured to eliminate the mechanical induced jitter noise using determining a synchronization signal from a dedicated servo layer.