I had a U3 type USB 2 GB drive go bad. It just loaded down the data lines and completely confused the computer. It knew something had been plugged in but it was not sure what and it was not happy sort of locking the PC up. Strange how a little device loading down the serial buses gave so much grief. You think a PC would be smart enough to go "I don't know what the heck that is and I am going to ignore it" But no it kept trying to read it. I threw it away.