Created attachment 5787 make-usage-free-string-more-clear.patch Write "xx MB of xx MB free (xx% used)", especially in device tooltip.
Created attachment 5809 Make-usage-free-string-more-clear.patch Updated patch to additionally show "Usage:" instead of "Free Space:" to prevent repetitive "Free Space" and "free".
Not to sound silly, but would this actually be slightly clearer/more correct? "xx GB free of xx GB (xx% used)" Somehow I'm also wondering about (mostly because the percentage seems easier to read at first glance) "Usage: xx% used (xx GB free of xx GB)" Don't wanna drag this discussion on forever, but if we're already changing the string, we might as well think of not just slightly altering it.
There are quite a few possible combination. Honestly, I would ask Nick about it. There might have been a certain reason why the string has been defined as is.
Created attachment 5883 screenshot-properties.png Screenshot with patch from 11342 and the patch from this bug.
Fixed in http://git.xfce.org/xfce/thunar/commit/?id=7fde0c0a35dca940e763361216c1da263748adcb.