Sans Digital 4ESPCIE Four eSATA Ports PCI-Express (x8) Host Adapter Fully compliant with SATA I and SATA II. Supports Serial ATA Generation 2 transfer rate of 3.0 Gbps. Supports Serial ATA II Port Multiplier. Supports RAID 0, 1, 0+1, 5 for Windows. Supports Windows 2000, XP, Vista, 2003 Server, MAC OS 10.3.x or later, and Linux.