Abstract: A head disk assembly ("HDA") comprises an enclosure including a base and a pivot bearing cartridge having a shaft and a outer shell rotatable about the shaft. The outer shell has a cylindrical surface. The shaft is affixed to the base at a predetermined location. The enclosure has an internal volume with a limited height above the predetermined location. The cartridge has an elongated portion in the volume, the elongated portion having a height approximately equal to the limited height. The HDA further comprises a plurality of rotating disks, each having at least one recording surface. The HDA further comprises an arm stack comprising a plurality of arms, and a plurality of head gimbal assemblies. Each arm has a stacking portion and a cantilever portion. Each head gimbal assembly has one end attached to the cantilever portion of a respective arm and has an opposite end positioned adjacent a recording surface.

Abstract: An assembly for locking a trailer hitch to a trailer ball. The inventive device includes a mounting plate securable between a hitch ball and a vehicle hitch. A trailer tongue securing assembly is pivotally mounted to the mounting plate and can be pivoted over the hitch ball to capture a trailer tongue therebetween. A ball securing assembly is pivotally mounted to the mounting plate and can be positioned over a mounting shank of the ball to preclude removal of the ball. A lock assembly extends between the ball securing assembly and the trailer tongue securing assembly to preclude unauthorized or unintentional decoupling of the hitch.