Seagate introduces the next generation of drives 3.5 "enterprise class. ES.3 new Constellation drives are available in capacities of 500GB, 1TB, 2TB, 3TB, 4TB for SAS and SATA interfaces, and will rotate at a speed of 7200 rpm. The special noteworthy large cache 128 MB available for each model and the lowest in class power consumption through the use of new technology PowerChoice. A new drives will also be available in a version with encryption technology SED (self encrypting drive).

Source: Seagate.com