A disc that never leaves the case can never be scratched. Save your Wii games to an external hard drive with this handy tutorial for speedier and scratch-free playback. Lifehacker reader Mike put together a tutorial on enabling hard-drive-based playback on your Wii. It isn’t as simple as just plugging in an external USB drive , but if you’re comfortable messing around with your Wii, it also isn’t an impossibly geeky task. You need to have the Homebrew Channel installed. We’ve covered how to inst