A storage device assembly includes a storage device, a bracket and a securing member. The storage device defines a first securing hole. The bracket includes a sidewall with an opening. The securing member is attached to an outside of the sidewall and includes an actuating end, a securing end, and a pivot portion formed between the actuating end and the securing end. The actuating end includes a ridge portion. The pivot portion is pivotally attached to the sidewall. The storage device abuts the actuating end of the securing member to force the securing end to pivot toward the sidewall and engage the first securing hole, and the actuating end extends through the opening and to be pressed by the storage device when located in the bracket.