An assembly for removably connecting data storage devices is provided for coupling a plurality of such devices within a computer or file server. The assembly comprises a plurality of trays each having a data storage device and a first electrical connector mounted thereto. Each tray contains an adapter assembly, having a second electrical connector, for consolidating the plurality of signals between the computer and the device. The trays are removably inserted within a housing having a plurality of printed circuit boards for connecting to the first electrical connectors of the inserted trays. A plurality of locking and actuating assemblies mounted within the housing govern insertion and removal of the trays into and out of the housing and passage of signals between the electrical connectors.