CalDigit USB 3.0 and eSATA 6G for Mac and PC FASTA-6GU3-Pro Dual Interfaces On A Single Card - 2 USB 3.0 & 2 eSATA 6G Ports Blazing Performance - 5Gb/s USB 3.0 & 6Gb/s eSATA Mac OS X & Windows Compatible Mac: Supported on OS X 10.8.5 & above (Driverless) PC: Windows 7 & above (Will require driver installation)