Samsung claims the Samsung X5 is capable of read and write speeds of 2800MB/s and 2300MB/s respectively; if those ring true in our testing, this will be the single-fastest external drive we've seen, without question. To achieve those speeds, Samsung have used an M.2 NVMe drive featuring the latest 3-bit MLC V-NAND, paired with a high-speed controller and their TurboWrite technology.