Seagate BarraCuda 510 SSD 256GB M.2 NVMe Internal Solid State Drive - PCIe Gen3 x4 - M.2 2280-S2 - NVMe 1.3 - 3D TLC NAND - Sequential read speed up to 3100MB/s - Sequential write speed up to 1050MB/s (ZP256CM30041)