Patent Number: 8,797,667

Title: Disk drive calibrating bias signal for touchdown sensor

Abstract: A disk drive is disclosed comprising a head actuated over a disk, the head comprising a touchdown sensor comprising a resistance. A bias signal is applied at a reference value to the touchdown sensor at a reference temperature, and a corresponding reference resistance of the touchdown sensor is measured. An operating value for the bias signal is generated based on a predetermined operating temperature of the touchdown sensor, the reference resistance, the reference temperature, and a thermal coefficient of resistance (TCR) of the touchdown sensor, wherein the TCR specifies a change in temperature of the touchdown sensor relative to a change in the resistance of the touchdown sensor.

Inventors: Barlow; Carl E. (Lake Forest, CA), Tsai; Chun Sei (Tustin, CA), O'Dell; Thomas A. (Sunnyvale, CA), Fowler; David E. (San Jose, CA), Wachenschwanz; David E. (Saratoga, CA), Singh; Balvinder (Gilroy, CA)

Assignee: Western Digital Technologies, Inc.

International Classification: G11B 5/60 (20060101)

Expiration Date: 8/05/12018