HGST Ultrastar 7K4000 HUS724040ALE640 (0F14683) 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5' Internal Enterprise Hard Drive Bare Drive

2.0 million hours MTBF 6Gb/s SATA & SAS interface models 24x7 accessibility for enterprise-class, capacity-optimized applications 5-year limited warranty