Turn an available PCI Express (1x) slot into an external SATA (eSATA) connection. Supporting SATA 300 (SATA II) hard drives and data transfer rates of up to 3Gbps, this is the perfect solution if you need an extra eSATA port to externalize your storage. It also comes with an internal SATA port which could be used alternatively for SATA connection, but not at same time as eSATA.