I have softmodded my Wii and have had a 250gb my passport connected with all my backup games with no problems playing the games.
I decided to buy myself a new drive for the backups and bought a Samsung 500 gb drive, this is where the problems start. I used WBFS Manager 3.0 to copy the backups from the 250 to the 500 most work ok but Mario at the Olympics as a few problems. Most of the games in Mario and Sonic at the Winter Olympics work ok but some ( Curling, Bobsled) have corupted screens
I have deleted the backup and reinstalled the game but same problem,it works ok from the game disc.