A protective cover includes a base plate, and a cover unit cooperating with the base plate to define an accommodating space and including an opening communicating with the accommodating space for entry of a first or second storage device into the accommodating space. At least one pad member is connected foldably to the base plate and is operable to move between unfolded and folded positions. The pad member is folded over the base plate when in the folded position. The accommodating space is adapted to accommodate the first storage device when the pad member is in the unfolded position and the second storage device when the pad member is in the folded position.