Patent ID: 8559138

Claim:
A suspension for a hard disk drive having: a microactuator on a first side of a central longitudinal axis of the suspension; a pseudo symmetry structure that is not a microactuator disposed on a second and opposite side of the central longitudinal axis and in generally mirror relation to the microactuator; wherein the pseudosymmetry structure comprises a spring formed integrally in a stainless steel component of the suspension, and a passive weight affixed to the suspension, the passive weight being located closer to the central longitudinal axis than is the spring; and wherein the pseudo symmetry structure has a mass that is within 20% of the mass of the microactuator and a stiffness that is within 40% of the stiffness of the microactuator in order to compensate for the mass and stiffness of the microactuator, thus making the suspension more mechanically symmetric about the longitudinal axis.