The Lenovo ThinkPad X1 Yoga 5th Generation Laptop Supports Single Drive Configuration Only. (One M.2 NGFF (2280) Solid State Drive) Note: M.2 Drives with PCI NVMe Generation 4.0 x4 performance is downgraded to closer to Generation 3.0 x4 performance due to the system slot limitation. (The M.2 slot supports PCIe NVMe Solid State Drives)