The Dell Precision-5570 Mobile Workstation 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 to accommodate for the larger M.2 (2280) slots. (Both M.2 slots support Generation 4.0 x4 and 3.0 x4 PCIe NVMe Solid State Drives)