The Alienware m15 R2 Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: The M.2 2230 Drive uses a adapter bracket p/n 0R88X3 and heat shield p/n 08856F to accommodate for the larger M.2 2280 slot. If Installing a M.2 2280 Drive, you will need the M.2 2280 thermal heatsink cooling bracket p/n 047W2D for installation. (M.2 slot-1 (SSD1) supports SATA and PCIe NVMe Drives and M.2 slot-2 (SSD2) supports PCIe NVMe Drives only)