Measuring and testing – Instrument proving or calibrating – Roughness or hardness
Reexamination Certificate
2006-10-17
2006-10-17
Noland, Thomas P. (Department: 2856)
Measuring and testing
Instrument proving or calibrating
Roughness or hardness
Reexamination Certificate
active
07121133
ABSTRACT:
A glide head calibration technique uses two fly height calibrations on a disk media certifier. The first calibration point uses a spin down on bump technique at a first height, and the second calibration point uses a spin down on disk media roughness at a second lower height. With two height data points, a fly height curve of each glide head is approximated very accurately. Once the fly height curve is derived for each head, any fly height can be dialed-in by the disk media certifier for glide testing. This technique achieves glide fly heights between about 4 nm and 8 nm and does so with improved tolerances.
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Chu Norman
Duan Shanlin
Galindo Patricia
Lo Yu
Ngo Hang Fai
Bracewell & Giuliani LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Noland Thomas P.
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