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Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics
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Amazon.com: Western Digital 16TB WD Red Pro NAS Internal Hard Drive HDD - 7200 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" - WD161KFGX : Electronics
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Save $160 when you purchase two WD Red Pro 20TB HDDs for $599 — that's just $15 per TB | Tom's Hardware
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