Neogamma: The Game Disc Could Not be Read

Mario Kart Wii (US), my favorite game, will not work on Neogamma. And if it doesn't work, theres no point in backing it up! I don't want to lose one of my favorite games!
So anyways, it gives me the error that "The Game Disc Could Not be Read (Please refer to the Wii operations manual.)". I was looking around for a solution, and I thought I might have the wrong IOS (Or was it ISO?) installed. I have 149 rev 17 (for the gamecube backup launcher). Will I need a different one?
The funny thing is that my Super Mario Galaxy 2 backup works on Neogamma, same disc and burnt at same speed, 4.0x, Sony DVD-R. (On Linux using Brasero)
Sometimes when luanching Mario Kart Wii backup it will just say "An Error has occurred. Please refer to the Wii operations manual for...help?" (or something like that.)
Anything I can do? I'll do a system check if you'd like me to.

we suggest -r discs burned at 1x - 2x speeds.

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Originally Posted by Shift_Lock

we suggest -r discs burned at 1x - 2x speeds.

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LOL Brasero's lowest is 4.0x. I have Windows, so I could check what DVD burners and at what speeds they have.

try imgburn

OK, burnt in Win Vista on ImgBurn speed 1x and it works! Thanks!