On the spec front, the 4TB 850 EVO 2.5-inch storage system tops out at 540MB/s read and 520MB/s write speeds, which matches the performance of the company’s other capacities, running the array from a meagre 120GB on up. With the new 4TB 850 EVO, Samsung uses its well-respected V-NAND and rates it for 300 terabytes written. While there are faster drives available out there, but what is worth noting here is that you can use any models in the 850 EVO line in any PC with a SATA connection, making them great options for those interested in an upgrade to faster storage. The Samsung 4TB 850 EVO SSD will be available from July 31. Source