Comment 1 for bug 665749

This happens because the request to unsync the folder is added at the end of the queue. So it will only remove the folder after the complete sync of all the metadata. The U1 team is currently discussing ways to better handle this. You can run this command in a Terminal to see the metadata queue. At the end you should see the DeleteVolume.

u1sdtool --waiting-metadata

If you want to remove a folder fast that you have accidentally added to the queue you can follow these steps:

u1sdtool --list-folders - note the ID that is used by new UDF
u1sdtool --unsubscribe-folder=$ID (where $ID = id that was received by running list-folders)
u1sdtool --quit - this will quit the syncdaemon and drop the queue
u1sdtool --start - start syncdaemon again, but do not connect
(in new terminal, since this will not release the terminal right away) - u1sdtool --delete-folder=$ID
(back in the original Terminal) u1sdtool --connect

thanks,
duanedesign