HGST EMC CLAR2000 HUS724020ALS640 2 TB SAS 2 3.5 inch Enterprise Drives. These internal desktop drives have a storage capacity of 2 TB each and a rotation speed of 7200 RPM. They are compatible with PCs and are designed for enterprise use. With a form factor of 3.5 inches and a silver color, these HDDs are ideal for high-performance storage needs in a desktop machine. The drives also come with a cache size of 64 MB and are equipped with SAS 2 interface for efficient data transfer.