Product Detail Four external USB 2.0 ports Driver-free for Windows and Mac Supports both 3.3V and 5V Max interface transfer rate up to 480Mbits/s OHCI, EHCI and USB Revision 2.0 compliant . The "LaCie 130813 USB 2.0 PCI Card Design by Sismo" is best product for you. We recommended LaCie 130813 USB 2.0 PCI Card Design by Sismo