Patent ID: 8730611
Filing Date: 2014-05-20
Classification: G11B

Abstract:
1. A method of detecting a contact between a transducing head and a storage medium, the method comprising: applying an input signal to an actuator for actuating the transducing head, the input signal having a select power level and a known frequency; obtaining an output signal in response to the input signal; extracting at least one signal component from the output signal at the same known frequency or a harmonic of the same known frequency as the input signal applied to the actuator; determining whether the at least one extracted signal component indicates a contact between the transducing head and the medium; and repeating the applying the input signal to the actuator, obtaining an output signal in response to the input signal and extracting the at least one signal component from the output signal by increasing the power level of the applied wave pattern until the at least one extracted signal component indicates a contact between the transducing head and the storage medium.