Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of biasing or erasing
Reexamination Certificate
2011-01-18
2011-01-18
Tzeng, Fred (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of biasing or erasing
Reexamination Certificate
active
07872824
ABSTRACT:
A disk drive is disclosed having a disk, and a head actuated over the disk, the head comprising a magnetoresistive (MR) element. Control circuitry within the disk drive sets an operating bias current for the MR element by computing a target voltage for the MR element, applying a bias current to the MR element, measuring a voltage across the MR element corresponding to the bias current, and adjusting the bias current applied to the MR element until the measured voltage substantially equals the target voltage.
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Notice of Allowance dated Jul. 23, 2009 from U.S. Appl. No. 11/761,224, 16 pages.
Gibbons Matthew R.
Goode Jonas A.
Khapikov Andrei F.
Macchioni Curtis V.
Pan Tao
Tzeng Fred
Western Digital (Fremont) , LLC
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