@Ryexander: This is not the wrong section. Writing a game disk is not related to Scripting and is related to General RPG Maker-ness. So it won't be moved.
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Do you happen to use Postality Knights or the legal version of RMXP?
Try another project and extract game disk wise. If it's successful, add more space to it, and extract again. (You need to have a computer with lots of space for this method
). Keep adding game space and extracting the game disk until it makes that error. If your test project exceeds 125 MB or something and the game disk extraction is a success, then you know it's your project causing a problem. If so, copy your project and paste it under some different folder name or something, try sneaky methods to trick RMXP. But test out the first method first....