When exporting a read-only media (e.g. a CD) and marking it as read-only in tlclient, gnome reports "disk full" when trying to create a file on it.
Created attachment 239 [details] packet trace Packet trace showing nautilus trying to create a file on the drive. One can see that it does a fsstat and that the reply says the directory is writeable, but 0 bytes left on the device. This might be why gnome sends up "disk full" instead of "read-only".
This only happens on Windows.