For Game Cube it is not possible nintendont does not work whit 2 hdds. I have the same situation here. If your problem is with the Loader Gx itself check you CIOS version and also loader gx if they both are in the last build.
Noob question:
The Wii U has a limit of 292 for Digital Games installed, is it possible remove this limit in a future update of Mocha?
Also, somebody tested de vwii on Mocha? Is it working?