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Western Digital 6TB WD Red Plus NAS Internal Hard Drive HDD - 5640 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5,

Western Digital 6TB WD Blue PC Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, , 64 MB Cache, 3.5,

Western Digital 6TB WD Purple Surveillance Storage HDD, Internal Drive, 256MB Cache - WD64PURZ - Walmart.com,

Amazon.com: Western Digital 6TB WD Red Plus NAS Internal Hard Drive HDD - 5640 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5