[quotemsg=17051364,0,1659151][quotemsg=17051188,0,1799812]They are not compatible with my Epson 800V scanner and Bose companion 5.[/quotemsg]
I'm willing to bet that's the fault of the hardware manufacturer not properly adhering to the USB spec[/quotemsg]This conversation can get complicated since USB 2.0 and USB 3.0 are separate data standards and use separate data pathways. A third-party USB 3.0 controller actually has two controllers (USB 2.0 and USB 3.0) built in. These aren't always friendly with legacy devices. While the Intel controller usually is legacy-friendly, a third-party hub between it and the ports can cause similar issues. You'll find that some boards have only 2 USB 3.0 ports out of 6 or 8 that are legacy-friendly, and they're usually not labeled in a way to make that determination easy.