Western Digital Blue 1tb Sn550 Nvme M.2 2280 Pci-Express 3.0 X4 3d Nand Internal Solid-State Drive (WDS100T2B0C) - Capacity: 250 GB, Interface: Pcie, Dimensions (L X W X H): 3.15" X 0.87" X 0.09", Sequential Read Performance: 2400MB/S, Sequential Write Performance: 950MB/S