Hi,
I have a 2 Tb Samsung hard drive in a USB 3.0 enclosure. When I connect this to my P55A-UD4P motherboard using the external (JMICRON) USB3.0 back connectors, the hard disc randomly disappears, even when I/O activity (a backup) is in progress. When I connect the same enclosure to the USB2.0 ports I do not have this issue. I'm running Windows 7 64-bit and I've installed the latest drivers and BIOS.
Thank you.