i have had this problem for some time with my thumb drives. the thumb drive was formatted with ms-dos file system. when for example i have 100mb of free space on the drive and i remove something that is 10mb i should be left with 110mb of free space right? well once i send the file to trash it is gone from the drive but i still have only 100mb of free space? i can unmount and remount the drive and its still the same? what is causing this? the file is gone but no more free space? this never happened under windows.