Kanex Thunderbolt to eSATA plus USB 3.0 Adapter Extend the use of your existing eSATA-equipped external storage unit by connecting it to your Mac. Since many users are still on eSATA equipment this adapter will add value by adding USB 3.0 support. Conveniently, the Kanex Thunderbolt to eSATA adapter adds an extra SuperSpeed USB 3.0 port to your Mac or PC computer so users can connect to more everyday peripherals, like external hard drives, a keyboard or mouse Minimum system requirements are Mac: OS X V10.8.4 and above and Windows 7 and above (32-bit and 64bit) If a customer is using windows, drivers are needed and they can be obtained through our website.