There is one task that is more and more needed by the computer user these days, and that is the avility to mount external disk drives.
With distributions like Arch Linux, where you configure almost everything, that may or may not always work, and you may get some errors while trying to mount external devices automaticall by using the Window Manager.
If you get that error, be sure you have done these steps.
Your user is listed in these groups:
And in your
.xinitrc file, you have this line
exec ck-launch-session openbox instead of
exec openbox, of course you need to replace openbox by fluxblox or any other window manager you are using.