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 continuous magnetic servo information on a disk, a data recording layer configured to record magnetic data therein, wherein the dedicated servo layer comprises a plurality of tracks, wherein a first track of the plurality of tracks comprises a first magnetic preamble signal, wherein the first track further comprises a first magnetic servo burst signal of a first frequency, wherein a second track of the plurality of tracks comprises a second magnetic preamble signal, wherein the second track further comprises a second magnetic servo burst signal of a second frequency which is different than the first frequency, wherein the first magnetic servo burst signal and the second magnetic servo burst signal comprise a plurality of common transitions, wherein the common transitions are provided at a pre-determined frequency, wherein the magnetic servo information is provided on the servo layer distinct from the data recording layer to provide continuous location detection, and wherein the first frequency and the second frequency have a ratio of n:m with integer numbers n and m or have a ratio of n+1:n with an integer number n.
2. The recording medium of claim 1 , wherein the plurality of common transitions comprise transitions on a cross track direction.
3. The recording medium of claim 1 , wherein the magnetic servo information comprises a plurality of alternately arranged preambles and servo bursts.
4. The recording medium of claim 1 , wherein each magnetic servo burst signal comprises information for providing positioning information.
5. A data storage device, comprising the recording medium of claim 1 .
6. The data storage device of claim 5 , further comprising: a phase lock loop circuit configured to generate a reference clock signal for synchronization of at least one of read and write operations over the data layer, based on the continuous magnetic servo information under the data layer.
7. A method for generating a reference clock signal for synchronization of at least one of a read operation and a write operation of a data storage device, the data storage device comprising a dedicated servo layer for providing continuous magnetic servo information on a disk and a data recording layer configured to record magnetic data therein, the method comprising: generating the reference clock signal based on a plurality of tracks in the dedicated servo layer for providing continuous servo information on a disk of the data storage device, wherein a first track of the plurality of tracks comprises a first magnetic preamble signal; wherein the first track further comprises a first magnetic servo burst signal of a first frequency, wherein a second track of the plurality of tracks comprises a second magnetic preamble signal; wherein the second track further comprises a second magnetic servo burst signal of a second frequency which is different than the first frequency, wherein the first magnetic servo burst signal and the second magnetic servo burst signal comprise a plurality of common transitions, wherein the common transitions are provided at a pre-determined frequency, wherein the magnetic servo information is provided on the servo layer distinct from the data recording layer to provide continuous location detection, and wherein the first frequency and the second frequency have a ratio of n:m with integer numbers n and m or have a ratio of n+1:n with an integer number n.
8. The method of claim 7 , further comprising:
initializing a phase lock loop circuit upon reading of the first magnetic servo burst signal and the second magnetic servo burst signal, so as to generate the reference clock signal synchronous with the pre-determined frequency.
9. The method of claim 7 , wherein the magnetic servo information comprises a plurality of alternately arranged preambles and servo bursts.
10. The method of claim 7 , wherein each magnetic servo burst signal comprises information for providing positioning information.
11. A data storage device, comprising: a dedicated servo layer for providing continuous magnetic servo information on a disk, a data recording layer configured to record magnetic data therein, a clock reference generation circuit configured to generate a reference clock signal for synchronization of at least one of a read operation and a write operation of the data storage device, wherein the clock reference generation circuit is configured to generate the reference clock signal based on a plurality of tracks in the dedicated servo layer for providing continuous servo information on a disk of the data storage device, wherein a first track of the plurality of tracks comprises a first magnetic preamble signal, wherein the first track further comprises a first magnetic servo burst signal of a first frequency, wherein a second track of the plurality of tracks comprises a second magnetic preamble signal, wherein the second track further comprises a second magnetic servo burst signal of a second frequency which is different than the first frequency, wherein the first magnetic servo burst signal and the second magnetic servo burst signal comprise a plurality of common transitions, wherein the common transitions are provided at a pre-determined frequency, wherein the magnetic servo information is provided on the servo layer distinct from the data recording layer to provide continuous location detection, and wherein the first frequency and the second frequency have a ratio of n:m with integer numbers n and m or have a ratio of n+1:n with an integer number n.