Read write (RW) head position control for self servo writing process
The present invention provides a method of generating magnetic reference patterns on a disk or other magnetic media. This involves writing a first magnetic reference pattern to the disk with a servo writer. The disk may then be transferred to a hard disk drive. Control circuitry within the hard disk drive may recognize the first magnetic reference pattern and then position a RW head within the hard disk drive based on the first magnetic reference pattern. As the RW drive is accurately positioned based on the first magnetic reference pattern a second magnetic reference pattern may be written to the disk using the RW head. The RW head location is determined based on the velocity and phase between the read-write head and servo setter marks contained within the first magnetic reference pattern.
1. A method operable to generate magnetic reference patterns on a disk, comprising:
recognizing a first magnetic reference pattern on the disk, wherein the hard disk drive is operable to position a read write (RW) head within the hard disk drive, based on the first magnetic reference pattern; and
writing a second magnetic reference pattern to the disk using the RW head within the hard disk drive, wherein the RW head location is determined based on a velocity and phase between the RW head and a servo setter mark (SSM).
2. The method of claim 1 , wherein the first magnetic reference pattern is a spiral pattern.
3. The method of claim 1 , wherein the hard disk drive is operable to organize data to disk based on the second magnetic reference pattern.
4. The method of claim 1 , wherein the second magnetic reference pattern define sectors and tracks within the disk.
5. The method of claim 1 , wherein the first magnetic reference pattern is written from an inner diameter of the disk towards an outer diameter of the disk.
6. The method of claim 1 , wherein the first magnetic reference pattern is written from an outer diameter of the disk towards an inner diameter of the disk.
7. The method of claim 1 , wherein the first magnetic reference pattern overwritten by the second magnetic reference pattern.
8. A hard disk drive, comprising:
a disk controller;
at least one read write (RW) head;
at least one disk having a first magnetic reference pattern, wherein the disk controller is operable to write a second magnetic reference pattern to the at least one disk with the at least one RW head; wherein a position of the at least one RW head within the hard disk drive is based on the first magnetic reference pattern, wherein the RW head location is determined based on a velocity and phase between the RW head and the first magnetic reference pattern.
9. The hard disk drive of claim 8 , wherein the first magnetic reference pattern comprises a spiral pattern and servo setter marks (SSM).
10. The hard disk drive of claim 8 , wherein the hard disk drive is operable to organize data to the at least one disk based on the second magnetic reference pattern.
11. The hard disk drive of claim 8 , wherein the RW head location is determined based on a velocity and phase between the RW head and the SSM.
12. The hard disk drive of claim 8 , wherein the first magnetic reference pattern is written by a servo writer.
13. The hard disk drive of claim 12 , wherein the first magnetic reference pattern is written from an inner diameter of the disk towards an outer diameter of the disk.
14. The hard disk drive of claim 12 , wherein the first magnetic reference pattern is written from an outer diameter of the disk towards an inner diameter of the disk.
15. The hard disk drive of claim 8 , wherein the first magnetic reference pattern overwritten by the second magnetic reference pattern.
16. A method operable to define sectors and tracks on a disk, comprising:
writing a first magnetic reference pattern to the disk with a servo writer,
transferring the disk to a hard disk drive;
recognizing the first magnetic reference pattern on the disk, wherein the hard disk drive is operable to position a read write (RW) head within the hard disk drive, based on the first magnetic reference pattern; and
writing a second magnetic reference pattern to the disk using the RW head within the hard disk drive, wherein the RW head location is determined based on a velocity and phase between the RW head and the first magnetic reference pattern, and wherein the second magnetic reference pattern defines sectors and tracks on the disk.
17. The method of claim 16 , wherein the first magnetic reference pattern is a spiral pattern.
18. The method of claim 16 , wherein the hard disk drive is operable to organize data to disk based on the second magnetic reference pattern.
19. The method of claim 16 , wherein the RW head location is determined based on a velocity and phase between the RW head and the SSM.
20. The method of claim 16 , wherein the servo writer comprises a laser positioning system operable to precisely locate and position a servo writer RW head, wherein the servo writer RW head is operable to write the first magnetic reference pattern to disk.
21. The method of claim 16 , wherein the first magnetic reference pattern is written from an inner diameter of the disk towards an outer diameter of the disk.
22. The method of claim 16 , wherein the first magnetic reference pattern is written from an outer diameter of the disk towards an inner diameter of the disk.
23. A disk controller operable to generate a magnetic reference pattern that defines physical structures within a disk, comprising:
an interface module operable to couple the disk controller to a hard disk drive;
a memory module; and
a processing module operably coupled to the memory module, wherein a combination of the processing module and memory module are operable to execute instructions that:
recognize an initial magnetic reference pattern on the disk;
locate a read write (RW) head relative to the initial magnetic reference pattern on the disk, wherein the RW head's location is determined based on a velocity and phase between the RW head and the initial magnetic reference pattern; and
direct the RW head to write the magnetic reference pattern that defines physical structures to the disk.
24. The disk controller of claim 23 , wherein the disk controller is implemented as an integrated circuit.
25. The disk controller of claim 23 , wherein the interface module is further operable to interface the hard disk drive to a host computer system.