Abstract: A hard disk drive module packaged so as to be insertable and removable into a chassis by a user. The hard disk drive module is housed within a connectorized housing, including interface circuits on a printed circuit board, all of which is pluggable into a computer chassis, or the like.

Abstract: A chassis assembly housing a plurality of modules, each module having a rigid case with four beveled corners. Small contact area guide rails in the chassis engage each module to provide a high precision alignment between high density contacts of the chassis backplane, and the back side of each module. Each module has a side lid that is snap fit for easy removal thereof and access to the circuit components housed within the module case. Each module, which is about the size of a cigarette package, can accommodate hundreds if socket contacts which mate with corresponding pins in the chassis backplane.