The Dell XPS 13 7390 Laptop Supports Single Drive Configuration Only. (One M.2 NGFF (2280) or (2230) Solid State Drive) Note: The M.2 (2280) Drive has a unique thermal Plate and cannot be Interchanged with the M.2 (2230) Drive thermal Plate. If replacing the M.2 (2230) Drive for a M.2 (2280) Drive, you will need the M.2 (2280) Drive thermal plate p/n 90Y66 for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)