mdorantes. As you see I have been having the same problem below.

Having problem with USB Pen Flash Drive. If formatted on 3000 the PC won't recognised the Flash Drive at all.
If the Flash Drive is formatted on the PC and then a file copied to the Flash Drive can not be seen by the 3000. If a file is copied from 3000 on to Flash Drive then the PC can not see the file.
This particular Flash Drive is a Mini King 128mb.