StarTech PEXSATA24E 2-Port eSATA + 4-Port SATA II PCI Express x4 SATA Controller Adapter Card Two internal ports with two additional switchable internal/external ports enables versatility for changing needs Dual profile design to fit into Full or Low Profile/small form factor (SFF) systems Backed by a StarTech.com lifetime warranty and free lifetime technical support Four independent SATA channels Two permanent internal SATA ports, with two switchable internal/external SATA ports Fully Compliant with Serial ATA 1.0a specifications with transfer rates up to 3.0 Gbps Support for Native Command Queuing Support for Port Multiplier technology