Now I am in Fedora Core 4 Linux, and I am working a bunch of JPG files. As far as these JPG files are in Hard disk, all JPG files behave wonderfully fine. The problem started when I tried to save (move) all JPG files to a FLASH drive. The Nautilus 2.10.0 Filemanager can display only about the half of the JPG files copied onto FLASH drive. Certain (several) JPG thumbnails show only half way, or not at all, while the rest of more than 50% thumbnails appears perfect. Then a further problem I want to solve now is UNMOUTING the VOLUME (the FLASH dirve). I guess Filemanager Nautilus keep trying to read the rest of poor JPG files, UNMOUNT request always hit [Busy working the device] error. What is the best and easiest way to stop reading the poor JPG file(s), and naturally UNMONT the volume FLASH drive. Is there any way to kill the process? Which process should I kill? In other words, How to kill the Nautilus Thumbnail reading process? I will post a few relevant attachment. Please review and help me! Thanks.