WD Ultrastar DC HC310 4TB SATA 6Gb/s 3.5″ Internal Data Center HDD, Up to 233 MB/s Data Transfer Rate, 256MB Cache, 7200RPM, 2 Million Hours MTBF, 600,000 Load/Unload Cycles | HUS726T4TALA6L4

The 4TB Ultrastar 7200 rpm SATA 3.5″ Internal Data Center HDD from WD is an enterprise-grade drive designed for demanding 24×7 data storage solutions. Ultrastar drives are built to be durable, using CMR technology and featuring up to an error tolerance of <1 in 10 15 , an MTBF rating of 2 million hours, and an Annualized Failure Rate (AFR) of 0.44%, depending on the model. Endurance aside, this drive offers fast 7200 rpm performance with 256MB of cache and data transfer speeds of up to 233 MB/s. Key Features 4TB Storage Capacity 3.5"