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Amazon.com: Western Digital 8TB WD Red Plus NAS Internal Hard Drive HDD - 5640 RPM, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5,

Western Digital WD84PURZ 8TB WD Purple Surveillance Hard Drive, 128MB Cache, 3.5-inch Form Factor, SATA,

Amazon.com: Western Digital 8TB WD Purple Surveillance Internal Hard Drive - SATA 6 Gb/s, 256 MB Cache, 3.5,

Western Digital 8TB WD Purple Surveillance Internal Hard Drive - SATA 6 Gb/s, , 256 MB Cache, 3.5,