DVD Read Error Bad burn/media or out of date IOS. Possibly a computer issue.
Q. If it is a computer issue, how do I fix it?
A. First, make sure the type of media you're using is compatible with the Wii and/or your computer's DVD Burner. Make sure you are using DVD-R discs, seeing as they are most compatible. Verbatim DVD-R discs burned at 4x work perfectly.
DVD Read Error Bad burn/media or incorrect cios/neogamma version. Also this error will persist on newer wiis, meaning that they have the new D2-3 chip which cannot read backups at all. Only option for them is USB loading.