Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX. Special Feature Western Digital 4TB SATA. Compatible Devices NAS systems. NASware 3.0 technology increases your drives’ compatibility with your existing network and devices.
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