Patent ID: 6560852
Filing Date: 2003-05-13
Classification: G11B,Y10T

Abstract:
A method of making a disc drive having an actuator designed with an asymmetrical arm having a length, the arm having first and second longitudinal sides, the method comprising steps of:(a) determining that the actuator is designed with a spring-mass structure characterized by an oscillation mode having an initial phase difference between a first and a second mass of the arm of the designed actuator; (b) modifying the arm of the designed actuator by removing a portion of the first side, the first side having a total time-averaged strain energy greater than a total time-averaged strain energy of the second side, so that the modified arm has a modified phase difference between the first and the second mass, the modified phase difference having a frequency-averaged magnitude smaller than a frequency-averaged magnitude of the initial phase difference across a relevant frequency range of at least 50 Hertz; and (c) assembling the designed actuator into the disc drive so that the first mass is positioned adjacent a first rotatable disc.