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Original Western Digital WD 4TB Red NAS Hard Disk Drive 3.5" 4TB Internal Hard Drive 5400RPM SATA 6Gb/s 64MB Cache For Desktop - AliExpress
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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 - Amazon.com
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WD40EFRX-68N32N0 - Western Digital WD40EFRX-68N32N0 Red 4TB SATA 6Gb/s 5400RPM 64MB Cache (Advanced Format) 3.5-inch Internal Hard Drive - serverevolution.com
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