Data recording medium and method for generating a reference clock signal
View Patent ↗Various embodiments provide a recording medium. The recording medium may include a dedicated servo layer for providing servo information. The dedicated servo layer may include a plurality of tracks. A first track may include a first servo signal. A second track may include a second servo signal. The first servo signal and the second servo signal may include a plurality of common transitions. The transitions may be provided at a pre-determined frequency.
1. A recording medium, comprising:
a dedicated servo layer for providing servo information,
wherein the dedicated servo layer comprises a plurality of tracks,
wherein a first track comprises a first servo signal,
wherein a second track adjacent to the first track comprises a second servo signal,
wherein the first servo signal includes a first servo burst at a first frequency, and the first servo burst includes first transitions at the first frequency,
wherein the second servo signal includes a second servo burst at a second frequency different from the first frequency, and the second servo burst includes second transitions at the second frequency, and
wherein the first transitions at the first frequency and the second transitions at the second frequency comprise a plurality of common transitions at a pre-determined frequency such that the second transitions in the second servo burst are aligned with selected ones of the first transitions in the first servo burst at the pre-determined frequency.
2. The recording medium of claim 1 , wherein a least common multiple of the first frequency and the second frequency is an integer.
3. The recording medium of claim 1 , wherein a ratio of the first frequency to the second frequency is n:m, where n and m are integers.
4. The recording medium of claim 1 , wherein a ratio of the first frequency to the second frequency is n+1:n, where n is an integer.
5. The recording medium of claim 1 , wherein a third track adjacent to the second track comprises a third servo signal, the third servo signal includes a third servo burst at the first frequency, and the third servo burst includes third transitions at the first frequency.
6. A system, comprising:
the recording medium of claim 1 ; and
a reader configured to detect the second frequency of the second servo burst of the second track while positioned over the first track.
7. The recording medium of claim 1 , wherein the dedicated servo layer is separate from a data recording layer of the recording medium.
8. The recording medium of claim 1 , wherein the dedicated servo layer is located below a data recording layer of the recording medium.
9. A method of generating a reference clock signal from a recording medium, the method comprising:
providing, on the recording medium,
a dedicated servo layer for providing servo information, wherein the dedicated servo layer comprises a plurality of tracks,
a first track comprising a first servo signal, and
a second track adjacent to the first track comprises a second servo signal,
wherein the first servo signal includes a first servo burst at a first frequency, the first servo burst including first transitions at the first frequency, wherein the second servo signal includes a second servo burst at a second frequency different from the first frequency, the second servo burst including second transitions at the second frequency, and wherein the first transitions at the first frequency and the second transitions at the second frequency comprise a plurality of common transitions at a pre-determined frequency such that the second transitions in the second servo burst are aligned with selected ones of the first transitions in the first servo burst at the pre-determined frequency;
detecting the second frequency of the second servo burst of the second track using a reader positioned over the first track; and
generating the reference clock signal based on the detected second frequency.
10. The method of claim 9 , wherein a least common multiple of the first frequency and the second frequency is an integer.
11. The method of claim 9 , wherein a ratio of the first frequency to the second frequency is n:m, where n and m are integers.
12. The method of claim 9 , wherein a ratio of the first frequency to the second frequency is n+1:n, where n is an integer.
13. The method of claim 9 , wherein a third track adjacent to the second track comprises a third servo signal, the third servo signal includes a third servo burst at the first frequency, and the third servo burst includes third transitions at the first frequency.
14. The method of claim 9 , wherein the dedicated servo layer is separate from a data recording layer of the recording medium.
15. The method of claim 9 , wherein the dedicated servo layer is located below a data recording layer of the recording medium.