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Western Digital Red NAS 4TB 5400RPM SATA 6Gb/s 64MB Cache 3.5" Enterprise Class Hard Drive - WD40EFRX - Drive Solutions
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WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM Class SATA 6Gb/s 128MB Cache 3.5 Inch - WD4002FFWX - Walmart.com
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