[QUOTE="c_rake"]You won't lose memory by watching YouTube videos. The only things that use memory are Save Files, Virtual Console and WiiWare games, and Channels.GamerBoy53...and game discs. Did you miss the part where he said save files?
And no, memory blocks are for saving things to the Wii or SD card. Watching videos will use a good chunk of RAM while you're watching it and I'm not sure how well the Wii will be able to handle something like that, but you can't fill up your RAM permanently. RAM use is all temporary.
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