In order to spot whether a device (e.g. root) might get filled up soonish it might be helpful to optionally show “progressbars” (maybe also the gtk-widget, not sure what'd work best here) to symbolize that.
The mockup below should point out how this could theoretically look. An alternative to putting the progressbar below the item in question would be to put it behind the item as a “background-layer”, but that might make things less readable. — Simon Steinbeiß 2012/01/03 13:54
See also bug 5901.