An apparatus includes an enclosure, a first interconnect card, a second interconnect card, and a connection circuit board. The enclosure receives a first data storage device and a second data storage device. The first interconnect card is connected to the first data storage device. The second interconnect card is connected to the second data storage device. The second interconnect card includes an external connector which is capable of connecting to a peripheral apparatus outside of the enclosure. The connection circuit board is connected to the first and the second interconnect cards. The first data storage device communicates with the external connector via the first interconnect card, the connection circuit board, and the second interconnect card. The second interconnect card communicates with the external connector via the second interconnect card.