I know sometimes backups don't come with the proper .dvd or that people don't know how to make one. Sometimes people don't know how to manually enter the layerbreak information. So I made this little program that will make the .dvd file for you. It supports the two main image formats I have seen (.000 and .iso).
1: Open LayerBreakMaker.exe.
2: Select your Xbox 360 image.
3: Place the .dvd that was created in the same folder as the Xbox 360 image.
Pretty simple right?