When I have four externals plugged into the usb on reboot I get a disk read error press ctrl alt del to restart. It doesn't matter which HDD's or which usb slots only if all 4 are pluged in. I am running nvidia 680i sli mother board. If I plug the 4th one in after the reboot then everything works but on the next reboot I get the same issue. Any help would be greatly appreciated!