Help with burning games with my drivekey

I have my wii modded with the Drivekey. I also have other burned wii games that I bought overseas that work fine. But, when I try to download and burn games, it doesnt work. Here's what I have been doing. I use Maxwell DVD-RW 4.7 GB disks, I use Winrar to extract the .iso files and I use imgburn at 4x speed to download. I have tried burned Tiger Woods 2010 & The Conduit with no luck. The game channel never brings the games up. It just goes to an error message saying the disc cant be recognized after about 10 secounds or so. The Imgburn program even tells me the disc was created sucessfully. What am I doing wrong?

Try using DVD-R disks. Sometimes the quality or type of discs affect the reading.