Magnetic recording disk having DTR patterned CSS zone
View Patent ↗A method and apparatus is described for gradually transitioning a slider from operation over a patterned data zone to landing on a patterned CSS zone. The ratio of raised area width to recessed area width of a pattern in a transition zone and/or CSS zone may be varied across the radial dimension of the disk. By changing the ratio of raised area width to recessed area width of the pattern in the transition from slider operation over the data zone to landing in the CSS zone, it is possible to gradually change the height of the slider from flying to non-flying conditions.
1. A magnetic recording disk, comprising:
a data zone to store data, the data zone having a first pattern of raised areas and recessed areas; and
a CSS zone having a second pattern of raised areas and recessed areas, wherein the raised and recessed areas of the second pattern have a varying ratio of widths across a radial dimension of the CSS zone.
2. The magnetic recording disk of claim 1 , wherein the first pattern comprises a discrete track recording pattern.
3. The magnetic recording disk of claim 1 , wherein the first pattern comprises a discrete bit recording pattern.
4. The magnetic recording disk of claim 1 , wherein the raised and recessed areas of the second pattern nearest to the data zone has a first ratio approximately in a range of 2/1 to 3/1.
5. The magnetic recording disk of claim 1 , wherein the raised and recessed areas of the second pattern farthest from the data zone has a second ratio approximately in a range of 1/2 to 1/50.
6. The magnetic recording disk of claim 1 , wherein each of the recessed areas of the second pattern has a depth, and wherein a plurality of the recessed areas of the second pattern has different depths.
7. The magnetic recording disk of claim 1 , further comprising a transition zone having a third pattern of raised areas and recessed areas.
8. The magnetic recording disk of claim 7 , wherein the third pattern has a different ratio of raised area widths to recessed area widths than the first pattern.
9. The magnetic recording disk of claim 8 , wherein each of the recessed areas of the third pattern has a depth, and wherein a plurality of the recessed areas of the third pattern has different depths.
10. The magnetic recording disk of claim 8 , wherein the third pattern has a different ratio of raised area widths to recessed area widths than the second pattern.
11. The magnetic recording disk of claim 8 , wherein the third pattern has a varying ratio of raised area widths to recessed area widths across a radial dimension of the transition zone.
12. The magnetic recording disk of claim 11 , wherein each of the recessed areas of the third pattern has a depth, and wherein a plurality of the recessed areas of the third pattern has different depths.
13. The magnetic recording disk of claim 11 , wherein the raised and recessed areas of the third pattern nearest to the data zone has a first ratio approximately in a range of 2/1 to 1/10.
14. The magnetic recording disk of claim 13 , wherein the raised and recessed areas of the third pattern farthest from the data zone has a second ratio approximately in a range of 1/10 to 1/50.
15. The magnetic recording disk of claim 1 , wherein at least one of the raised and recessed areas of the second pattern has a ratio approximately in a range of 1/2 to 1/50.
16. A magnetic recording disk, comprising:
a data zone to store data, the data zone having a first pattern of raised areas and recessed areas;
a CSS zone having a second pattern of raised areas and recessed areas different than the first pattern; and
a transition zone disposed between the data zone and the CSS zone, the transition zone having a third pattern of raised areas and recessed areas different than the first and second patterns.
17. The magnetic recording disk of claim 16 , wherein the third pattern has a varying ratio of raised area widths to recessed area widths across a radial dimension of the transition zone.
18. The magnetic recording disk of claim 17 , wherein each of the recessed areas of the third pattern has a depth, and wherein a plurality of the recessed areas of the third pattern has different depths.
19. The magnetic recording disk of claim 17 , wherein the raised and recessed areas of the third pattern nearest to the data zone have a first ratio approximately in a range of 2/1 to 1/10.
20. The magnetic recording disk of claim 19 , wherein the raised and recessed areas of the third pattern farthest from the data zone have a second ratio approximately in a range of 1/10 to 1/50.
21. The magnetic recording disk of claim 17 , wherein at least one of the raised and recessed areas of the third pattern has a ratio of approximately in a range of 1/2 to 1/50.
22. A disk drive, comprising:
a magnetic recording disk, comprising:
a data zone to store data, the data zone having a first pattern of raised areas and recessed areas;
a CSS zone having a second pattern of raised areas and recessed areas different than the first pattern; and
a transition zone disposed between the data zone and the CSS zone, the transition zone having a third pattern of raised areas and recessed areas different than the first and second patterns; and
a slider comprising a Hall effect head or a head having a magneto-resistance read element operatively coupled to the magnetic recording disk.
23. The disk drive of claim 22 , wherein the raised and recessed areas of the third pattern nearest to the data zone have a first ratio approximately in a range of 2/1 to 1/10.
24. The disk drive of claim 23 , wherein the raised and recessed areas of the third pattern farthest from the data zone have a second ratio approximately in a range of 1/10 to 1/50.
25. The disk drive of claim 22 , wherein at least one of the raised and recessed areas of the third pattern has a ratio approximately in a range of 1/2 to 1/50.
26. The disk drive of claim 22 , wherein the slider further comprises a plurality of protrusions extending beyond an air bearing surface of the slider.
27. The disk drive of claim 26 , wherein the plurality of protrusions are configured to contact the second pattern raised areas of the CSS zone when the slider is parked on the CSS zone.
28. The disk drive of claim 22 , wherein the head has a giant magneto-resistance read element.
29. The disk drive of claim 22 , wherein each of the recessed areas of the third pattern has a depth, and wherein a plurality of the recessed areas of the third pattern has different depths.
30. A method of operating a head over a magnetic recording disk, comprising:
operating the head at a first height over a data zone of a disk during at least one of a read operation and a write operation, wherein the data zone comprises a first pattern of raised and recessed areas;
operating the head at a second height in a transition zone of the disk, the second height being less than the first height, wherein the transition zone comprises a second pattern of raised and recessed areas; and
landing the head on a contact-start-stop (CSS) zone of the disk, wherein the landing zone comprises a third pattern of raised and recessed areas.
31. The method of claim 30 , wherein the transition zone is a non-data zone.
32. The method of claim 31 , wherein at least one of the first, second and third patterns of raised and recessed areas is different than the others.
33. The method of claim 30 , wherein at least one of the raised and recessed areas of the second pattern of the transition zone has a ratio approximately in a range of 1/2 to 1/10.
34. The method of claim 30 , wherein at least one of the raised and recessed areas of the third pattern of the landing zone has a ratio approximately in a range of 1/10 to 1/50.
35. A method of operating a head over a magnetic recording, comprising:
operating the head at a first height over a data zone, the disk having an inner diameter edge, the disk further having a pattern of raised and recessed areas, each of the raised areas having a width and each of the recessed areas having a width; and
gradually transitioning the height of the head from the first height to land on a CSS zone of the magnetic recording disk using at least two different ratios of raised area widths to recessed area widths across a radial dimension of the magnetic recording disk between the data zone and the inner diameter edge.
36. The method of claim 35 , wherein gradually transitioning further comprises using a first ratio of raised area widths to recessed area widths in the data zone and a second ratio of raised area widths to recessed area widths in the CSS zone.
37. The method of claim 36 , wherein gradually transitioning further comprises using a third ratio of raised area widths to recessed area widths in a transition zone to reduce the height of the head above the transition zone to a second height being lower than the first height, the transition zone being disposed between the data zone and the CSS zone.
38. A disk drive system, comprising:
means for operating a head at a first height over a data zone having a pattern of raised and recessed areas, the disk having an inner diameter edge, the disk further having a pattern of raised and recessed areas, each of the raised areas having a width and each of the recessed areas having a width; and
means for gradually transitioning the height of the head from the first height to land on a CSS zone of a magnetic recording disk using at least two different ratios of raised area widths to recessed area widths across a radial dimension of the magnetic recording disk between the data zone and the inner diameter edge.
39. The disk drive system of claim 38 , comprising means for reducing stiction between a slider having the head and the CSS zone.