WD Red Pro WD4003FFBX - hard drive - 4 TB - SATA 6Gb/s - WD4003FFBX - Internal Hard Drives - CDW.com
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WD Red NAS Hard Drive WD40EFAX - Hard drive - 4 TB - internal - 3.5-inch - SATA 6Gb/s - 5400 rpm - buffer: 256 MB | Dell USA
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Amazon.com: Western Digital 4TB WD Red NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD40EFAX : Electronics
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