An apparatus for mounting hard disk drive and storage device without the use of tools or fasteners includes a supporting base comprising opposite ends, elastic connecting members, and two side plates connected perpendicularly and respectively to opposite ends of the supporting base. Two elastic connecting members and an end plate connect between free ends of the pair of side plates through the elastic connecting members. Each side plate comprises one or more internal mounting pins and corresponding mounting holes are defined in sides of hard disk drive or storage device. A rotating plate is rotatable between closed and opened positions, the rotating plate can be closed to align the pins so as to clamp the device in place, or opened.