Well - almost great.
I can't eject the disk safely, only "unmount", which crashes Nautilus.
If I try just inserting another disk, it doesn't recognise it.
I can copy a file to it, but there's no way of exiting without crashing Nautilus, and the file is not there when I restart.
I can at least recover my old files, which was the object of the exercise, but it would be nice to get it working properly - or am I being too demanding?
Sorry: I don't understand your final words - could you elaborate?