Western Digital WDS400T2B0A, Blue, Capacity 4TB, FF 2.5", 3D NAND SATA III SSD WDS400T2B0A, SATA III 6Gbps, Read Up to 560MB/s, Write Up to 530MB/s, Random Read 95,000 IOPS, Random Write 82,000 IOPS, Endurance 600 TBW. Ready for your high performance computing needs, a WD Blue SATA SSD offers high capacity, enhanced reliability, and blazing speed.