Abstract: Mounting plates are described for mounting one or more disk drives in a computer drive dock. Each mounting plate has a number of tracks each formed by a pair of ridges. The track width is greater at the ends than in the central region. Screws are threaded into the standard mounting holes tapped in the sides of the disk drive. These screws also hold brackets to the sides of the disk drive. Two of the mounting plates are attached opposite each other on the inside walls of the drive dock, and the heads of the screws are slid into the tracks. The brackets have wings which are attached to the front of the drive dock to hold the disk drive in place. One of the tracks is designed to accommodate all three sizes of so-called "third-high" drives. A unique structure for attaching the mounting plates to the side walls of the drive dock without threaded fasteners is also disclosed.