Rotating disk storage device and pivot bearing

Abstract

Embodiments of the invention position accurately an actuator head suspension assembly (AHSA) relative to a magnetic disk without using any positioning jig, as achieved through a simple structure and involving no increase in manufacturing, and to prevent the AHSA from being charge. In one embodiment, a conductive AHSA includes a pivot opening formed to provide a step at an adjoining portion of two holes having different hole diameters from each other. A pivot bearing assembly includes a first conductive roller bearing and a second conductive roller bearing. The first and the second roller bearings include outer races and inner races with balls interposed between the outer races and the inner races. The first and the second roller bearings are disposed in tandem to achieve the following arrangements. Specifically, the outer race of the second roller bearing fits into a hole having a larger hole diameter in the pivot opening, while the outer race of the first roller bearing fits into hole having a smaller hole diameter in the pivot opening. There is interposed a conductive spacer between the first and the second roller bearings. The spacer abuts on the step in the pivot opening. A conductive pivot shaft is inserted in each of the inner races of the first and the second roller bearings disposed in tandem in the pivot opening.