Version: (using KDE 4.3.1) Compiler: gcc (Gentoo 4.3.4 p1.0, pie-10.1.5) 4.3.4 OS: Linux Installed from: Gentoo Packages I have seen this many times over the last few months. I use Dolphin to copy files from my computer to a FAT32 flash usb stick. When it is done, it refuses to unmount, saying the device is busy. blah-blah are the files I copied tdanotebook ~ # lsof /media/disk/ COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME kio_thumb 21275 trenta 13r REG 8,33 734013440 413 /media/disk/blah-blah kio_thumb 21275 trenta 15r REG 8,33 728512512 378 /media/disk/blah-blah The only way to fix it is to wait a really long time, or kill kio_thumb. The drive is finished writing, as it no longer flashes the light. I don't think this is a dolphin problem, but a KDE subsystem problem.
Like bug #170290 where kio_thumb blocks the umount action.
Yes, that is it. It never came up in my searches because they used the word "removed" rather than "unmount".
*** This bug has been marked as a duplicate of bug 168804 ***