Magnetic spacing measurement
View Patent ↗One embodiment in accordance with the invention includes a method. The method can include utilizing a harmonic test on a magnetic disk of a hard disk drive that produces a first result and a second result. A magnetic spacing distance between a transducer head of the hard disk drive and the magnetic disk can be determined utilizing the first result and the second result. A flying height between a head structure of the hard disk drive and a surface of the magnetic disk can be determined utilizing the magnetic spacing distance.
1. A method comprising:
writing a first write pattern on a magnetic disk;
utilizing a harmonic test on said magnetic disk of a hard disk drive that produces a first result and a second result concurrently with said writing;
determining a magnetic spacing distance between a transducer head of said hard disk drive and said magnetic disk utilizing said first result and said second result and a writer transition that is associated with said transducer head writing data to said magnetic disk; and
determining a flying height between a head structure of said hard disk drive and a surface of said magnetic disk utilizing said magnetic spacing distance.
2. The method as described in claim 1 , wherein said utilizing said harmonic test comprises writing a pattern magnetically onto said magnetic disk.
3. The method as described in claim 1 , wherein said utilizing said harmonic test on said magnetic disk comprises utilizing said transducer head.
4. The method as described in claim 1 , wherein:
said first result comprises a first measured harmonic of said harmonic test; and
said second result comprises a second measured harmonic of said harmonic test.
5. The method as described in claim 1 , wherein said determining said magnetic spacing distance comprises utilizing a read gap length that is the distance between two head shields associated with said transducer head.
6. The method as described in claim 1 , wherein said determining said magnetic spacing distance comprises utilizing a thickness of magnetic media of said magnetic disk.
7. The method as described in claim 1 , wherein said determining said flying height further comprises utilizing a thickness of a coating disposed above said magnetic disk.
8. The method as described in claim 1 , wherein said determining said magnetic spacing distance comprises utilizing a magnetic spacing correction term.
9. The method as described in claim 1 , wherein said determining said flying height further comprises utilizing a thickness of a coating of material on said transducer head.
10. A system comprising:
means for writing a first pattern onto a magnetic disk of a hard disk drive to establish a harmonic having a first measured harmonic and a second measured harmonic, said writing performed concurrently with measuring said first and second harmonics;
means for determining a magnetic spacing distance between a transducer head of said hard disk drive and said magnetic disk utilizing said first measured harmonic and said second measured harmonic and a writer transition that is associated with said transducer head writing data to said magnetic disk; and
means for determining a flying height between a head structure of said hard disk drive and a surface of said magnetic disk by subtracting a parameter from said magnetic spacing distance.
11. The system of claim 10 , wherein said parameter comprises a thickness of a coating of material on said magnetic disk.
12. The system of claim 11 , wherein said means for determining said flying height further comprises utilizing a thickness of a coating of material on said transducer head.
13. The system of claim 12 , wherein said parameter comprises a distance that a surface of said coating of material is recessed from a head structure surface located closest to said surface of said magnetic disk.
14. The system of claim 10 , wherein parameter comprises a thickness of a coating of material on said transducer head.
15. The system of claim 10 , wherein said means for determining said magnetic spacing distance further comprises utilizing a read gap length that is the distance between two head shields associated with said head structure.
16. The system of claim 10 , wherein said means for writing said pattern onto said magnetic disk comprises utilizing said transducer head.
17. The system of claim 10 , wherein said means for determining said magnetic spacing distance further comprises utilizing a magnetic spacing correction term.
18. A non-transitory computing device readable medium having readable code embodied therein for causing a system to perform a method comprising:
writing a pattern onto a magnetic disk of a hard disk drive to establish a harmonic having a first measured harmonic and a second measured harmonic;
determining a magnetic spacing distance between a transducer head of said hard disk drive and said magnetic disk utilizing said first measured harmonic and said second measured harmonic and a writer transition that is associated with said transducer head writing data to said magnetic disk wherein said writing is performed concurrently with measuring said first and second harmonics; and
determining a flying height between a head structure of said hard disk drive and a surface of said magnetic disk by utilizing said magnetic spacing distance and a parameter.
19. The non-transitory computing device readable medium of claim 18 , wherein said writing said pattern onto said magnetic disk comprises utilizing said transducer head.
20. The non-transitory computing device readable medium of claim 18 , wherein said determining said magnetic spacing distance further comprises utilizing a read gap length that is the distance between two head shields of said head structure.
21. The non-transitory computing device readable medium of claim 18 , wherein said determining said magnetic spacing distance comprises utilizing a thickness of magnetic media of said magnetic disk.
22. The non-transitory computing device readable medium of claim 18 , wherein said parameter comprises a thickness of a coating of material on said magnetic disk.
23. The non-transitory computing device readable medium of claim 18 , wherein said parameter comprises a thickness of a coating of material on said transducer head.
24. The non-transitory computing device readable medium of claim 18 , wherein said determining said flying height further comprises utilizing a recess distance.
25. A method comprising:
writing a pattern to a magnetic disk
utilizing a harmonic test on said magnetic disk of a hard disk drive that produces a first result and a second result wherein said writing is performed concurrently with said harmonic test; and
determining a magnetic spacing distance between a transducer head of said hard disk drive and said magnetic disk utilizing said first result and said second result and a writer transition that is associated with said transducer head writing data to said magnetic disk.
26. The method as described in claim 25 , wherein said utilizing said harmonic test comprises writing a pattern magnetically onto said magnetic disk.
27. The method as described in claim 25 , wherein said utilizing said harmonic test on said magnetic disk comprises utilizing said transducer head.
28. The method as described in claim 25 , wherein:
said first result comprises a first measured harmonic of said harmonic test; and
said second result comprises a second measured harmonic of said harmonic test.
29. The method as described in claim 25 , wherein said determining said magnetic spacing distance further comprises utilizing a read gap length that is the distance between two head shields associated with said transducer head.
30. The method as described in claim 25 , wherein said determining said magnetic spacing distance further comprises utilizing a thickness of magnetic media of said magnetic disk.
31. The method as described in claim 25 , wherein said determining said magnetic spacing distance further comprises utilizing a magnetic spacing correction term.
32. The method as described in claim 25 , wherein said transducer head is part of a head structure.