My Acer 5560 laptop has developed a USB speed problem. When I boot up, my external USB 3.0 HD is connected to a standard enhanced host controller (usb 2.0 driver) and initially works fine. Then for some strange reason the port changes to a standard OpenHCD controller (usb 1.0 driver) and I get the message "this device can perform faster....". The problem just isn't slower speeds. I can't complete a backup. I get a file error when the change happens. This "downshift" in usb speeds happens at random times, anywhere from 5 minutes to 2 hours. Things I've tried over the last 2 weeks: Moved HD to all 3 ports. Checked usb devices via DM, No warnings and all ports are working fine. Used USB Device Tree Viewer to verify that the external HD is changing from 2.0 to 1.0 controller. Deleted all usb drivers and let windows 7 reinstall them. Checked phoenix bios. No options for usb devices. Acer website has no new usb drivers and their bios update is older than mine (1.09 vs 1.17) Used a y-cable to give the 3.0 HD 2 ports and thus more power. Disabled all 1.0 controllers, hubs and ports to prevent the downshift. Drive light goes out. Changed power options to prevent sleep/hibernation modes. PLEASE HELP! I'm going blind. THANKS IN ADVANCE.