The Alienware x17 R2 Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: The M.2 2280 and 2230 Drives each use a unique thermal shield and cannot be interchanged. The M.2 2230 Drive uses thermal shield p/n 0XR11G and the M.2 2280 Drive uses thermal shield p/n 0C99KM. The M.2 2230 Drive uses a adapter bracket p/n 0R88X3 to accommodate for both of the larger M.2 2280 slots. (Both M.2 slots support Generation 4.0 x4 and 3.0 x4 NVMe Solid State Drives and can be set up as RAID0 or RAID1)