Patent ID: 8422171

Claim:
A disk drive comprising: a disk drive base; a disk rotably mounted to the disk drive base; a head stack assembly (HSA) mounted to the disk drive base, the HSA including an actuator body, at least one actuator arm extending from the actuator body, and a laminar flexible printed circuit (FPC), the laminar FPC including a first conductive layer that includes a first plurality of conductive traces; a second conductive layer that includes a second plurality of conductive traces; a dielectric layer between the first conductive layer and the second conductive layer; an integrated circuit (IC) chip mounted to the laminar FPC, the IC chip including a first plurality of terminals and a second plurality of terminals, the first plurality of terminals being closer to the first conductive layer than to the second conductive layer, the second plurality of terminals being offset towards the second conductive layer relative to the first plurality of terminals; a first plurality of conductive bumps contacting and connecting the first plurality of conductive traces to the first plurality of terminals; a second plurality of conductive bumps contacting and connecting the second plurality of conductive traces to the second plurality of terminals, the second plurality of conductive bumps defining an average bump diameter, the second plurality of conductive bumps being aligned with and passing through a plurality of openings through the dielectric layer.