Take those Internal Sata Ports and make them available outside the Box.
Creates Proper Sata External Ports Sometimes called ESata Ports
Great for External Hard Drives.

Product Features
Allows use of SATA-equipped devices outside of a computer case 9 inches long (22cm)
Two internal SATA connectors
Two external SATA (eSATA) connectors
Compatible with cables up to 2 meters long