Western Digital Red 4TB 5400RPM SATA 6Gbps 64MB Cache 3.5" Hard Drive WD40EFRX
Western Digital Red 4TB NAS Hard Drive WD40EFRX – 5400RPM SATA 6Gb/s 64MB Cache 3.5” HDD. Upgrade or expand your NAS storage with thisWestern Digital Red 6TB Hard Drive (WD40EFRX), designed specifically forNAS systems and 24/7 operation.