Used - The Western Digital WD Blue WD40EZRZ 4TB 3.5" SATA 5400RPM 64MB HDD is an internal desktop drive designed for use with PCs. With a storage capacity of 4TB and a cache size of 64MB, this hard drive offers fast read speeds of up to 150MB/s and a transfer rate of 6 Gbps. It is part of the WD Blue product line, known for its reliable performance and energy efficiency. This HDD is a great option for storing large amounts of data and files, making it ideal for home or office use. Working pull, tested and erased with WDDiag.