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What about something like this Portable External USB 2.0 DVD-ROM Drive for Wii/PC/Laptop $43.95 Free Shipping could it work?

Yeah that is pretty much what I thought here is some more information I found if it helps any..

Wii Model number and video region

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So I already soft modded the wii and I am able to go into the homebrew channel install homebrews with no problem Im using Wiiflow and I can load many games from usb, I havent had any issues with that...