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WD40EFRX-68WT0N0 - Western Digital 4TB 5400RPM SATA 6Gb/s 3.5-in HDD,

Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5,

Western Digital RED WD40EFZX 4TB 128MB Cache 3.5,

Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5