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Amazon.com: Western Digital WD40EFRX WD Red NAS Hard Drive - Hard drive - 4 TB - internal - 3.5 inch - SATA 6Gb/s - buffer: 64 MB - for WD My Cloud EX2, EX4 : Electronics
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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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WD Red Pro 4TB NAS HDD 3.5" 7200RPM SATAIII 256MB Internal Hard Drive WD4003FFBX – I.E.T. INDUSTRIAL ANTONIO PRIETO – SINCELEJO, SUCRE
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