Patent ID: 7375911

Claim:
A hard disk drive, comprising: at least one disk rotatable about an axis; an actuator assembly moveable relative to the disk; a transducer positioned on the actuator assembly; an actuator signal line; a processor; a piezoelectric actuator element disposed on the actuator assembly and electrically interconnected to the processor by the actuator signal line, wherein the piezoelectric actuator element is operable to move the at least one transducer relative to a surface of the disk; a sensor signal line; and a piezoelectric sensor element collocated with the piezoelectric actuator element for sensing a vibration, the piezoelectric sensor element being electrically interconnected to the processor by the sensor signal line, wherein the piezoelectric sensor element is electrically isolated from the piezoelectric actuator element, and wherein the piezoelectric actuator element and the piezoelectric sensor element comprise thin-film elements formed on a common substrate.