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Amazon.com: Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" - WD40EFRX : Electronics
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WD Red 4 TB NAS Hard Drive for 1-5 Bay NAS Environments - 3.5, SATA 6Gb/s, Intellipower, OEM Package - WD40EFRX at TigerDirect.com
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