Make sure you do a clean install of ATV first befoer installing Wooshbuild. It won't wipe of anything on your HDD but will clean up the internal memory which I think is causing your issuesThanks for that grog68.
I'm not sure what's going on at the moment as yesterday a recording was saved to media/usb under Root but one I did last night seems, somehow, to have resurrected the hard drive and saved it there.
I don't see how it did it, I can only assume that the drive was only hidden, not lost.
Totally confused now, so I think I will do a refresh anyway and also reinstall Whooshbuild (sorry, but I've done it a few times, so sort of used to it) and see if I can get everything back as it was.