The Lenovo ThinkPad P15s Gen 2 Laptop Supports Single Drive Configuration Only. (One M.2 NGFF (2280) or (2242) Solid State Drive) Note: This machine comes with One M.2 SSD slot that supports Generation 3.0 x4 PCIe NVMe Drives. If installing a M.2 Generation 4.0 x4 PCIe NVMe Drive in a M.2 Generation 3.0 x4 PCIe NVMe slot, the drive will run at Generation 3.0 x4 speeds. The M.2 (2242) Drive uses a adapter bracket p/n 5B40Z68814 to accommodate for the larger M.2 (2280) slot.