The Lenovo ThinkPad X390 Laptop Supports Single Drive Configuration Only. (One M.2 NGFF (2280) or (2242) Solid State Drive) Note: The M.2 (2242) Drive uses a adapter bracket p/n 02HL057 to accommodate for the larger M.2 (2280) slot. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)