I have a Verbatim 16GB USB and based on the compatibility list, it work on Wii but when I tried to open the game using CFG it won't load. It got stucked on CFG page, I can't open the games. However when I insert it with a video, WiiMC is able to read the USB. The USB is formatted using Wii Back up Manager as FAT32. Also, tried formatting it as NTFS using the same app, didn't work. Tried formatting it with WBFS Manager 3.0 but it doesn't recognize the drive. Are there instances that a USB doesn't work on a certain Wii?