The WDTVLIVEHUB won’t display files if you have incorrectly done the EXTENSION. Even if it was a TEXT file you renamed to “whatever.iso” it would still show it (though it would give an error trying to play it).
a) have not copied it, or
b) the extension is NOT “iso”
The best way to copy DVD’s IMO is these free programs:
I do a whole bunch, then MOVE my WDTVLIVEHUB to the Ethernet cable (faster), then transfer the files from my PC. I then move it back so it’s on wi-fi and hooked up to my TV, then create folder and move files if necessary (or do that before moving the box back). Add “Content” if desired.