Abstract: A computer apparatus includes a first cover, a second cover, a motherboard, an expansion device and a detach assisting assembly. The second cover is detachably disposed on the first cove, and has an accommodation space and an opening. The motherboard is disposed between the first and second covers. The expansion device disposed in the accommodation space and connected to the motherboard is drawable from the accommodation space through the opening. The detach assisting assembly disposed in the accommodation space includes a slidable member and a rotatable member. The slidable member is slidable relative to the second cover for rotating the rotatable member to drive the first pressing part to press a side of the expansion device away from the opening, and thereby at least a part of the expansion device protrudes from the accommodation space through the opening.

Abstract: The disclosure provides a fixation structure, for accommodating and fixing a storage module, including an accommodating housing. The accommodating housing includes a fixed housing and a movable housing. The fixed housing includes a bottom frame and a side frame. The side frame stands on three adjacent sides of the bottom frame to form an opening therebetween. The movable housing is detachably installed on the bottom frame to close the opening and forms an accommodation room with the fixed housing. The storage module is located in the accommodation room. The fixed housing and the movable housing are made of metal.