There are two major patches discussed in the link below and I have experienced one of them .. a lot. I move files off a flash drive all the time. Mostly beta software and podcasts with the occasional 1 GB ISO file. Well I used to think it was an U3 problem. Then after a few dozen Vista installs, research and forum readings later I found out it was Vista instead. I haven't downloaded these patches yet, however, considering the nature of one of them I will do so tonight.