HGST Ultrastar 7K6000 4TB 7200 RPM 512e SAS 12Gb/s 128MB Cache 3.5-Inch Enterprise Internal Hard Disk Drive – HUS726040AL5210 (0F22795)

SAS interface compatible with servers that have capable RAID controllersImproved power efficiency compared to prior generationAdvanced format 512eEnterprise-class reliability with a 2M hours MTBF rating and 0.44% AFRReliable, field-proven, 7th generation 5