Emails from Sara have not come through, or are garbled, I don't understand why. So I can't quote and have had to look at the archives. Mine get tagged as if my email is "INVALID", which it isn't. Sigh.
But...I had a typo in the "mount" call and had "nxfss" rather than "nxffs" (I didn't copy/paste the lines of code yesterday but manually typed them...Linux dev machine, Win10 email machine....bad bad bad move! Should know better. Go to the bottom of the class). This now works, with or without the FTL involved and I have a 32Mbyte mounted flash drive to play with :) Once again, thanks everyone.