Ran into that when I built my Myth box a few years ago. The tuner card had a USB component (no, don't ask) and it just would not work as 1.1 was not fast enough. Eventually found a jumper hiding in amongst the slots which changed some minor behaviour of the USB system. Now USB 2.0 worked. It was so wierd...

Such idiocy is unlikely to impair a mass-storage connection, though, as they will work at 1.1.

Wade.