when i try to copy large data over 2GB from my 8GB stick. some times the pc just freezes nothing happen!! so iv got to power down pc with start button then restart pc. this only happen some times im using the latest drivers. its using the fat file system but tested with the NTFS and the same thing happen so it cant be that. the size im copying is never over 3.5GB i beleave fat system can only deal with 4GB but im not sure what else to try? whats best to use in bios..640k or shadow "usb type"