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Amazon.com: HGST Ultrastar 7K4000 HUS724040ALA640 (0F14688) 4TB 64MB 7200RPM SATA 6Gb/s 3.5in Internal Enterprise Hard Drive - 5 Year Warranty : Electronics
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HGST Ultrastar 7K4000 HUS724040ALA640 (0F14688) 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive Bare Drive - Newegg.com
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