Abstract: A disk drive including a head disk assembly, a planar printed circuit board and a vibration damping system. The vibration damping system is fixed adjacent the outer surface of the printed circuit board and includes an external planar member of compressible foam composition and a substantially-planar rigid mass damper of like shape and extent and arranged so that the external planar member contacts both the outer surface of the printed circuit board and the upper major surface of the mass damper. The major surfaces of the mass damper include upwardly-convex bosses for receiving fastening screws to maintain a predetermined separation distance between the printed circuit board and the mass damper that is somewhat less than the unconstrained thickness of the external planar member of compressible foam composition.

Abstract: A spindle motor for a disk drive includes a shaft, an upper bearing, a lower bearing, a stator, a hub and wire guide body. The upper bearing surrounds the shaft. The lower bearing surrounds the shaft, is spaced-apart from the upper bearing, and includes an inner race. The stator surrounds the shaft between the upper bearing and the lower bearing, and includes a stator wire extending from a stator core. The hub is concentrically positioned about the stator. The wire guide body is secured between the shaft and the lower bearing, and includes a generally cylindrically shaped surface and a channel. The channel is sized to receive the stator wire and is formed adjacent to the cylindrically shaped surface such that the channel opens into at least one of the shaft and the inner race.

Abstract: A disk drive includes a disk drive base, a spindle motor, a first disk and a disk clamp. The rotary hub of the spindle motor includes a generally cylindrically-shaped hub wall and a hub flange including an inner annular surface adjacent to the hub wall, an outer annular surface and a flange land portion integrally formed with the hub flange. The land portion is positioned between the annular surfaces and defines a disk contact surface projecting above the annular surfaces, the disk contact surface being substantially centered on the hub flange. The first disk is supported by the disk contact surface to form a clearance between the annular surfaces and the first disk. A second disk may be coupled to the spindle motor and an annular disk spacer may be positioned between the disks. The annular disk spacer includes a first spacer surface facing the first disk and a second spacer surface facing the second disk.