Memory device

A memory device, comprising:

• a substrate, which comprises a first edge, a second edge, a third edge and a fourth edge, wherein the first edge is parallel to the third edge, the second edge is parallel to the fourth edge, the first edge is perpendicular to the second edge, and a length of the first edge is shorter than a length of the second edge;
• a first interface connector, disposed on the first edge, wherein the first interface connector comprises a plurality of first edge-board contacts, and the first edge-board contacts extend toward a first direction;
• a second interface connector, disposed on the second edge, the second interface connector comprises a plurality of second edge-board contacts, and the second edge-board contacts extend toward a second direction;
• and
• a plurality of memory chips, disposed on the substrate, wherein the second interface connector is located between the memory chips and the first interface connector in the first direction
• wherein the first interface connector is adapted to be inserted into a first interface slot, the second interface connector is adapted to be inserted into a second interface slot,
• wherein the memory device is selectively connects to the first interface slot or the second interface slot.