The Dell 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)