Add an internal SATA port & an external SATA (e SATA) port to your desktop computer through a PCI Express expansion slot. This PCI Express SATA Controller Card means that you can turn a PCI Express (1x) slot into one internal SATA & one external SATA (e SATA) connection. Supporting SATA 300 (SATA II) hard drives & data transfer rates of up to 3 Gbps, this controller card is the perfect solution if you need an extra SATA port or want to externalize your storage. The controller card is designed based on a native PCI Express single chipset that provides enhanced compatibility, reliability & performance for your external storage needs. Plus, PEXESATA2I features Port Multiplier support with command based switching for connecting multiple external hard drives to host PC or Mac Desktop through one e SATA connection.