Servo synchronization based on a servo synch mark that conflicts with self-clocking encoding algorithms
View Patent ↗Disclosed is a rotatable media storage device (RMSD) that performs servo synchronization based on a servo synch mark (SSM) that conflicts with self-clocking encoding algorithms. The RMSD includes a disk having a plurality of tracks wherein each track comprises a plurality of data regions interspersed between servo wedges. The servo wedges comprise a servo synch mark field including a servo synch mark (SSM) and a track identification field including a track identifier (TKID). The TKID is encoded in accordance with a self-clocking encoding algorithm whereas the SSM is encoded in accordance with a second algorithm that conflicts with the self-clocking encoding algorithm of the TKID. Thus, the SSM is prevented from being decoded as a portion of the TKID.
1. A rotating media storage device (RMSD) including a disk, the disk comprising:
a plurality of tracks, each track comprising a plurality of data regions interspersed between servo wedges, the servo wedges comprising:
a servo synch mark field including a servo synch mark (SSM);
a track identification field including a track identifier (TKID);
wherein the TKID is encoded in accordance with a self-clocking encoding algorithm and the SSM is encoded in accordance with a second algorithm that conflicts with the self-clocking encoding algorithm; and
wherein the SSM is prevented from being decoded as a portion of the TKID.
2. The RMSD of claim 1 , further comprising a head and a synch mark detection circuit having a synch mark detection mode, wherein, in the synch mark detection mode, the synch mark detection circuit validates a servo synchronization signal based on the head detecting an encoded pattern of the SSM that conflicts with the self-clocking encoding algorithm of the TKID.
3. The RMSD of claim 2 , wherein the synch mark detection circuit further,
reads an encoded pattern of the SSM; and
decodes the encoded pattern of the SSM.
4. The RMSD of claim 3 , wherein the synch mark detection circuit further comprises a matched filter to match the encoded pattern of the SSM with a SSM validation pattern in order to validate the servo synchronization signal.
5. The RMSD of claim 3 , further comprising a read/write channel, wherein the read/write channel decodes an encoded pattern of the TKID.
6. The RMSD of claim 1 , wherein at least some of the servo wedges further include a wedge identifier (ID) having an encoded pattern that is in accordance with the self-clocking encoding algorithm of the TKID.
7. The RMSD of claim 1 , wherein the SSM is located adjacent to the TKID.
8. The RMSD of claim 1 , wherein the SSM is not located adjacent to the TKID.
9. The RMSD of claim 1 , wherein the self-clocking encoding algorithm of the TKID is compatible with a Manchester encoding scheme.
10. The RMSD of claim 1 , wherein the encoding algorithm of the SSM conflicts with a Manchester encoding scheme.
11. A method for performing servo synchronization in a rotating media storage device (RMSD) including a disk having a plurality of tracks, each track comprising a plurality of data regions interspersed between servo wedges, the servo wedges including a servo synch mark field including a servo synch mark (SSM) and a track identification field including a track identifier (TKID), wherein the TKID is encoded in accordance with a self-clocking encoding algorithm and the SSM is encoded in accordance with a second algorithm that conflicts with the self-clocking encoding algorithm, the method comprising:
monitoring for an SSM; and
detecting a pattern of an SSM that conflicts with the self-clocking encoding algorithm of the TKID.
12. The method of claim 11 , wherein detecting a pattern of an SSM that conflicts with the self-clocking encoding algorithm of the TKID further comprises:
reading an encoded pattern of the SSM; and
decoding the encoded pattern of the SSM.
13. The method of claim 12 , wherein detecting a pattern of an SSM that conflicts with the self-clocking encoding algorithm of the TKID further comprises matching the encoded pattern of the SSM with a SSM validation pattern.
14. The method of claim 11 , wherein at least some of the servo wedges further include a wedge identifier (ID) having an encoded pattern that is in accordance with the self-clocking encoding algorithm of the TKID.
15. The method of claim 11 , wherein the SSM is located adjacent to the TKID.
16. The method of claim 11 , wherein the SSM is not located adjacent to the TKID.
17. The method of claim 11 , wherein the self-clocking encoding algorithm of the TKID is compatible with a Manchester encoding scheme.
18. The method of claim 11 , wherein the encoding algorithm of the SSM conflicts with a Manchester encoding scheme.
19. A computer system comprising a host computer and a rotating media storage device (RMSD) connected to the host computer, the RMSD comprising:
a disk having a plurality of tracks, each track comprising a plurality of data regions interspersed between servo wedges, the servo wedges comprising:
a servo synch mark field including a servo synch mark (SSM);
a track identification field including a track identifier (TKID);
wherein the TKID is encoded in accordance with a self-clocking encoding algorithm and the SSM is encoded in accordance with a second algorithm that conflicts with the self-clocking encoding algorithm; and
wherein the SSM is prevented from being decoded as a portion of the TKID.
20. The computer system of claim 19 , further comprising a head and a synch mark detection circuit having a synch mark detection mode, wherein, in the synch mark detection mode, the synch mark detection circuit validates a servo synchronization signal based on the head detecting an encoded pattern of the SSM that conflicts with the self-clocking encoding algorithm of the TKID.
21. The computer system of claim 20 , wherein the synch mark detection circuit further, reads an encoded pattern of the SSM; and
decodes the encoded pattern of the SSM.
22. The computer system of claim 21 , wherein the synch mark detection circuit further comprises a matched filter to match the encoded pattern of the SSM with a SSM validation pattern in order to validate the servo synchronization signal.
23. The computer system of claim 21 , further comprising a read/write channel, wherein the read/write channel decodes an encoded pattern of the TKID.
24. The computer system of claim 19 , wherein at least some of the servo wedges further include a wedge identifier (ID) having an encoded pattern that is in accordance with the self-clocking encoding algorithm of the TKID.
25. The computer system of claim 19 , wherein the SSM is located adjacent to the TKID.
26. The computer system of claim 19 , wherein the SSM is not located adjacent to the TKID.
27. The computer system of claim 19 , wherein the self-clocking encoding algorithm of the TKID is compatible with a Manchester encoding scheme.
28. The computer system of claim 20 , wherein the encoding algorithm of the SSM conflicts with a Manchester encoding scheme.