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WD Red Pro NAS Hard Drive - 4TB Capacity, Internal, 3.5 Form Factor, SATA 6Gb/s Interface, 7200 RPM, 256MB Buffer Size, 600,000 Load/Unload Cycles - WD4003FFBX at TigerDirect.com
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DN668214-56160 Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD M
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WD Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 64MB Cache 3.5 Inch - WD40EFRX - Walmart.com
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