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HGST Ultrastar 7K4000 HUS724040ALE640 (0F18567) 4TB 64MB Cache 7200RPM SATA 6.0Gb/s 3.5" Internal Enterprise Hard Drive - 1 Year Warranty
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HGST MegaScale DC 4000.B HMS5C4040ALE640 (0F19847) 4TB Coolspin 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive - 3 Year Warranty - Walmart.com
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