Magnetic spacing measurement
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorDanzhu Lu
Life of this patent
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Abstract
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.
Claims32
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.
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.
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.
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.
Dependencies are inferred from the claim text.