The Alienware m15 R6 Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: Both of the M.2 slots support M.2 2230 and 2280 Drives by moving the Solid State Drive screw mount to accommodate the form factor. If Installing a M.2 2280 Drive, you will need the M.2 2280 thermal heatsink cooling bracket p/n 026X1Y for installation. (Both M.2 slots support PCIe NVMe Generation 4.0 x4 and 3.0 x4 Solid State Drives)