| US 7,616,398 B2 | ||
| Fly height adjustment device calibration | ||
| Heng Gong, San Jose, Calif. (US); Mike X. Wang, San Jose, Calif. (US); and Jing Zhang, San Jose, Calif. (US) | ||
| Assigned to Hitachi Global Storage Technologies Netherlands B.V., Amsterdam (Netherlands) | ||
| Filed on Nov. 09, 2007, as Appl. No. 11/983,474. | ||
| Prior Publication US 2009/0122437 A1, May 14, 2009 | ||
| Int. Cl. G11B 5/60 (2006.01) | ||
| U.S. Cl. 360—75 | 25 Claims |
| 1. A method for calibrating a fly height adjustment device, said method comprising:
flying a magnetic transducer coupled with a head gimbal assembly at a fly height from a magnetic recording data track, wherein
said magnetic transducer is coupled with a fly height adjustment device;
reading with said magnetic transducer a read-back signal amplitude from said magnetic recording data track;
decreasing said fly height with said fly height adjustment device;
generating a linear fly height prediction from said read-back signal amplitude and from power delivered to said fly height
adjustment device during said decreasing said fly height; and
comparing said power delivered to said fly height adjustment device with a difference between said linear fly height prediction
and an implied fly height from said read-back signal amplitude, thereby calibrating said fly height adjustment device.
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