Storage expansion system

A storage expansion system comprising:

• an expansion apparatus comprising a first circuit board, a plurality of memory slots mounted on the first circuit board, a plurality of SATA interfaces corresponding to the memory slots mounted on the first circuit board and connected to a SATA port of a motherboard, a first power interface mounted on the first circuit board and connected to a power port of the motherboard, each of the plurality of memory slots comprising a protrusion, a plurality of first power pins electrically connected to the power interface, a plurality of first ground pins, and four first signal pins connected to a corresponding one of the plurality of SATA interfaces;
• and
• a serial advanced technology attachment dual in-line memory module (SATA DIMM) device comprising a second circuit board, a control chip arranged on the second circuit board, a plurality of storage chips arranged on the second circuit board and connected to the control chip, a power unit arranged on the second circuit board and connected to the control chip and the plurality of storage chips, and an edge connector and a notch arranged along a bottom edge of the second circuit board to be detachably engaged in one of the plurality of memory slots, the edge connector comprising a plurality of second power pins connected to the power unit, a plurality of second ground pins, and four second signal pins connected to the control chip;
• wherein in response to the edge connector of the SATA DIMM device being engaged in one of the plurality of memory slots of the expansion apparatus, the protrusion is engaged in the notch, the plurality of first power pins of the memory slot is connected to the plurality of second power pins of the SATA DIMM device, the plurality of first ground pins of the memory slot is connected to the plurality of second ground pins of the SATA DIMM device, and the four first signal pins of the memory slot is connected to the four second signal pins of the SATA DIMM device.