The Lenovo ThinkPad T15g Gen 2 Laptop Supports up to 3 Drives. (Three M.2 NGFF (2280) Solid State Drives) Note: One M.2 SSD slot supports Generation 4.0 x4 PCIe NVMe Drives (under keyboard) and Two M.2 SSD slots support Generation 3.0 x4 PCIe NVMe Drives (under bottom door). 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. This machine supports RAID 0/1 in the two M.2 PCIe NVMe Generation 3.0 x4 slots under the bottom door.