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Western Digital 4TB WD Red Plus NAS Internal Hard Drive - 5400 RPM Class, SATA 6 Gb/s, CMR, 128 MB Cache, 3.5" -WD40EFZX - Walmart.com
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4 TB NAS and Nearline Drives Face-Off: The Contenders - WD Red Pro Review: 4 TB Drives for NAS Systems Benchmarked
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