SATA Hard Drive is optimized for low-workload applications.

Designed for 24/7 environments that operate within 180 TB per year, 3.5 in. MegaScale DC4000.B has 4 TB capacity and 800K MTBF rating. Other specifications

[source: http://news.thomasnet.com/fullstory/SATA-Hard-Drive-is-optimized-for-low-workload-applications-20016142]