QUOTE(rainpl @ Dec 11 2007, 10:17 AM)
First of all, only DVD+R-DL work, minus ones won't. Second thing, you must set the booktype in your burning tool to DVD-ROM.
I don't think this is the case any more - another forum member had a thread which stated he had DVD-R DL working fine. You're spot on about the bitsetting tho - this is extremely important.
Most backup tools create a .dvd file. The new(er) version of IMGBurn knows how to handle these files and if you select it instead of the .iso, it will set the layerbreak for you.
A good tool to download is DVDInfoPro - it will tell you what booktype your drive is currently set to and it may even be able to change it for you.