Device, method of fabricating a media and method of servo writing

1. A device comprising:

a recording medium comprising a servo layer and a data recording layer, wherein the servo layer comprises

a substrate,

an adhesion layer disposed on the substrate,

a magnetic under-layer disposed on the adhesion layer,

a seed layer disposed on the magnetic under-layer, and

an intermediate layer disposed on the seed layer,

wherein the data recording layer is disposed on the intermediate layer;

a first recording head comprising a first side, wherein the first side faces the servo layer and has a first width and a first length, wherein the first width is sized for producing a magnetic field to write servo information on the servo layer, wherein the servo layer comprises a first servo track, a second servo track and a third servo track, wherein a portion of the first servo track is overlapped by the second servo track, and wherein a portion of the second servo track is overlapped by the third servo track; and

a second recording head configured to produce a magnetic field to write data on the data recording layer, wherein the second recording head has a second side facing the data recording layer, wherein the second side has a second width and a second length, wherein (i) the second width of the second side is less than the first width of the first side, or (ii) the second length of the second side is less than the first length of the first side.

2. The device of claim 1 , wherein the data recording layer is disposed between the first recording head and the servo layer.

3. The device of claim 1 , wherein the first recording head is a longitudinal ring recording head.

4. The device of claim 1 , wherein the first recording head is a single pole perpendicular magnetic recording head.

5. The device of claim 1 , wherein the first recording head is a shingled recording head.

6. The device of claim 1 , wherein the device is configured to adjust a writing current of the second recording head.

7. The device of claim 6 , wherein the second recording head is configured to adjust the magnetic field generated by the second recording head when the writing current is adjusted.

8. The device of claim 7 , wherein the magnetic field generated by the second recording head is smaller than the magnetic field generated by the first recording head.

9. The device of claim 1 , wherein the first recording head or the second recording head is a disk certification head.

10. The device of claim 1 , wherein the device comprises a spinstand, a disk certifier or a drag tester.

11. The device of claim 1 , wherein the second length of the second side is less than the first length of the first side.

12. The device of claim 11 , wherein the second width of the second side is less than the first width of the first side.

13. The device of claim 1 , wherein:

the substrate comprises glass;

the adhesion layer comprises tantalum;

the magnetic under-layer comprises iron, tantalum and carbon;

the seed layer comprises chromium and ruthenium; and

the intermediate layer comprises titanium and nickel.

14. The device of claim 13 , wherein the data recording layer comprises iron, platinum, carbon and silver.

15. A method of fabricating a medium, the method comprising:

depositing a servo layer above a substrate;

writing servo information on the servo layer; and

depositing a data recording layer above the servo layer after the servo information is written on the servo layer, wherein writing servo information on the servo layer comprises using a recording head comprising a width sized to produce a magnetic writing field to write servo information on the servo layer.

16. A method of writing servo information on a recording medium, the method comprising:

fabricating the recording medium to include a servo layer and a data recording layer, wherein the data recording layer is disposed on the servo layer, and wherein the fabricating of the recording medium comprises

fabricating the servo layer including

providing a substrate,

disposing an adhesion layer on the substrate,

disposing a magnetic under-layer on the adhesion layer,

disposing a seed layer on the magnetic under-layer, and

disposing an intermediate layer on the seed layer, and

disposing the data recording layer on the intermediate layer;

writing servo information on the servo layer via a first recording head, wherein the first recording head includes a first side, wherein the first side faces the servo layer and has a first width and a first length, wherein the first width is sized to produce a magnetic field to write the servo information on the servo layer, wherein the servo layer comprises a first servo track, a second servo track and a third servo track, wherein a portion of the first servo track is overlapped by the second servo track, and wherein a portion of the second servo track is overlapped by the third servo track; and

writing data on the data recording layer via a second recording head, wherein the second recording head comprises a second side, wherein the second side faces the data recording layer and has a second width and a second length, wherein the second width is sized for producing a magnetic field to write the data on the data recording layer, and wherein (i) the second width of the second side is less than the first width of the first side, or (ii) the second length of the second side is less than the first length of the first side.

17. The method of claim 16 , wherein the second length is less than the first length.

18. The method of claim 17 , wherein the second width is less than the first width.

19. A device comprising:

a recording medium comprising a servo layer and a data recording layer;

a first recording head comprising a first side, wherein the first side faces the servo layer and has a first width and a first length, wherein the first width is sized for producing a magnetic field to write servo information on the servo layer, wherein the servo layer comprises a first servo track, a second servo track and a third servo track, wherein a portion of the first servo track is overlapped by the second servo track, and wherein a portion of the second servo track is overlapped by the third servo track; and

a second recording head configured to produce a magnetic field to write data on the data recording layer, wherein the second recording head has a second side facing the data recording layer, wherein the second side has a second width and a second length, wherein (i) the second width of the second side is less than the first width of the first side, or (ii) the second length of the second side is less than the first length of the first side,

wherein the data recording layer is deposed on the servo layer subsequent to the servo information being written on the servo layer.

20. A method of writing servo information on a recording medium, the method comprising:

fabricating the recording medium to include a servo layer and a data recording layer, wherein the data recording layer is disposed on the servo layer;

writing servo information on the servo layer via a first recording head, wherein the first recording head includes a first side, wherein the first side faces the servo layer and has a first width and a first length, wherein the first width is sized to produce a magnetic field to write the servo information on the servo layer, wherein the servo layer comprises a first servo track, a second servo track and a third servo track, wherein a portion of the first servo track is overlapped by the second servo track, and wherein a portion of the second servo track is overlapped by the third servo track;

writing data on the data recording layer via a second recording head, wherein the second recording head comprises a second side, wherein the second side faces the data recording layer and has a second width and a second length, wherein the second width is sized for producing a magnetic field to write the data on the data recording layer, and wherein (i) the second width of the second side is less than the first width of the first side, or (ii) the second length of the second side is less than the first length of the first side; and

disposing the data recording layer on the servo layer subsequent to writing the servo information of the servo layer.