Mediasonic ProBox 2 Port External SATA 3 / III 6.0 Gbps PCI Express Card HP1-SS3 2 x eSATA Port - Transfer rate up to 6.0 Gbps, Support SATA I/II/III speed Support Port Multiplier and FIS-Based switch. Support up to 8 hard drives in total PCI Express Base Specification Rev 2.0, PCI Express Card Electromechanical Rev 2.0 Serial ATA AHCI Spec. Rev 1.3, Serial ATA Revision 3.0, One lan PCI Express for 2.5 and 5.0 Ghz signaling Single virtual Channel, SSC support, ECRC and Advanced Error Reporting Capability