Self-servo write stitching system
View Patent ↗A control system includes a write head and a control module configured to signal the write head to write a servo test track on a rotating medium at a position relative to a reference servo track on the rotating medium. The servo test track is written on the rotating medium subsequent to an interrupt event. The reference servo track having been written to the rotating medium prior to the interrupt event, detects the position of the servo test track relative to the reference servo track and signals the write head to write a new servo track on the rotating medium based on the detected position of the servo test track relative to the reference servo track.
1. A control system comprising:
a write head; and
a control module configured to
signal the write head to write a servo test track on a rotating medium at a position relative to a reference servo track on the rotating medium, the servo test track to be written on the rotating medium subsequent to an interrupt event, the reference servo track having been written to the rotating medium prior to the interrupt event,
detect the position of the servo test track relative to the reference servo track; and
signal the write head to write a new servo track on the rotating medium based on the detected position of the servo test track relative to the reference servo track.
2. The control system of claim 1 , wherein the new servo track is written to match a concentric servo pattern associated with the reference servo track.
3. The control system of claim 1 , wherein the control module is configured to signal the write head to write the new servo track in alignment with the reference servo track.
4. The control system of claim 1 , wherein the control module is configured to signal the write head to write the new servo track adjacent to the reference servo track without a gap being between the reference servo track and the new servo track.
5. The control system of claim 1 , wherein the interrupt event comprises a pause in spiral servo writing.
6. The control system of claim 1 , further comprising a position detection module configured to detect a radial position of the reference servo track and a radial position of the servo test track,
wherein the control module signals the write head to write the new servo track on the rotating medium based at least in part on the detected radial position of the reference servo track and the detected radial position of the servo test track.
7. The control system of claim 1 , wherein the control module is configured to:
determine an offset value based on the detected position of the servo test track relative to the reference servo track; and
signal the write head to write the new servo track on the rotating medium based on the offset value.
8. The control system of claim 1 , further comprising a position detection module configured to determine a circumferential position of the reference servo track and a circumferential position of the servo test track,
wherein the control module signals the write head to write the new servo track on the rotating medium based on the circumferential position of the reference servo track and the circumferential position of the servo test track.
9. The control system of claim 1 , further comprising a radial alignment system configured to determine radial repeatable run-out components of the reference servo track,
wherein the control module signals the write head to write the new servo track on the rotating medium based on the radial repeatable run-out components.
10. The control system of claim 1 , further comprising a timing alignment system configured to determine circumferential repeatable run-out components of the reference servo track,
wherein the control module signals the write head to write the new servo track on the rotating medium based on the circumferential repeatable run-out components.
11. The control system of claim 1 , wherein the control module is configured to phase out repeatable run-out compensation with newly written servo tracks.
12. The control system of claim 1 , wherein the control module is configured to:
determine repetitive position errors; and
signal the write head to write additional servo tracks on the rotating medium based the repetitive position errors.
13. The control system of claim 1 , wherein the control module is configured to phase out repetitive position error compensation with newly written servo tracks.
14. The control system of claim 1 , wherein the reference servo track is written on the rotating medium based on a partial spiral section.
15. The control system of claim 1 , wherein the rotating medium comprises a disk in a hard disk drive, a compact disc, or a digital versatile disc.
16. A method comprising:
signaling a write head to write a servo test track on a rotating medium at a position relative to a reference servo track on the rotating medium, the servo test track being written subsequent to an interrupt event, the reference servo track having been written prior to the interrupt event;
detecting the position of the servo test track relative to the reference servo track; and
signaling the write head to write a new servo track on the rotating medium based on the detected position of the servo test track relative to the reference servo track.
17. The method of claim 16 , wherein the new servo track is written to match a concentric servo pattern of the reference servo track.
18. The method of claim 16 , wherein the new servo track is written in alignment with the reference servo track.
19. The method of claim 16 , wherein the new servo track is written adjacent to the reference servo track without a gap being between the new servo track and the reference track.
20. The method of claim 16 , further comprising:
detecting a radial position of the reference servo track;
detecting a radial position of the servo test track; and
signaling the write head to write the new servo track on the rotating medium based at least in part on the detected radial position of the reference servo track and the detected radial position of the servo test track.