This pcie sata controller card has two sata channels that can be independently switched between the internal or external esata ports as needed this versatile add in card offers sata iii connectivity 6gbps while remaining backward compatible with sata i 1 5gbps and ii 3gbps device connections which helps eliminate the expense of having to upgrade drives includes both a full and low profilehalf height bracket for installation into any size of desktop computer two internalexternal swit