The Dell 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 R88X3 and heat shield p/n 8856F 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 47W2D for installation. (M.2 slot 1 SSD#1 supports SATA and PCIe NVMe Drives and M.2 slot 2 SSD#2 supports PCIe NVMe Drives only)