A mounting mechanism includes a computer chassis (90), a bracket (10) defining a pair of slideways (14, 16) in a sidewall (11) thereof for receiving corresponding sliding members (44) of a storage device (40), a power supply (80) rotatably attached in the computer chassis, and a hook (60, 60') pivotally attached to the sidewall of the bracket. The hook is for retaining the sliding members of the storage device in the slideways of the bracket. The power supply is rotated to engage the bracket and the hook thereby securing the storage device in the bracket.