Patent ID: 7755866

Claim:
A disc drive assembly comprising: a data disc and a motor for rotating said data disc; an actuator arm coupled to an actuator motor, the actuator arm having at least one of: a step extending along a first edge of said arm disposed away from said data disc and further disposed toward an axis of rotation of said data disc, the step along the first edge creating a thinner cross section at the first edge than at a lateral center of the arm; and a step extending along a second edge of said arm disposed toward said data disc and further disposed toward an outer edge of said data disc, the step along the second edge creating a thinner cross section at the second edge than at the lateral center of the arm; and a head gimbal assembly coupled to said actuator arm for reading data from said data disc: wherein said at least one step causes a distal end of said actuator arm to move laterally generally parallel to a surface of said disc when said actuator arm bends vertically due to vibration.