Designed to connect motherboards and host controllers to internal Serial ATA hard drives and DVD drives, quickly upgrading your computer to expand storage space (Note that this cable cannot provide power to your hard drive. It must be powered separately.) Allows data transfer speeds up to 6Gbps, 2 times faster than SATA II, and backward compatible with SATA and SATA II. Data transfer speeds are limited by the rating of the add-on device Secure Connection: The cable has lock latches on both ends to ensure a secure connection and fast and reliable file transfer