Comment 4 for bug 387791

Make the pop-up a floating windows without focus. OK to disconnect window should be shown as suggested by Alessio.
The window shouldn't have any buttons and should be closed by using the window decoration button (direct user interaction) or should close automatically when the user removes the drive (indirect user interaction).
Maybe add the minimize button so if the write is long the user can minimize the windows to the window list. Upon write completion the window should either pop-up or flash in the window list.

Any other suggestions?

Disclaimer: Not at my Ubuntu box so I'm just guessing that this isn't already implemented in some way.