There is no need that both audio_vts and video_ts folders to co-exist. Video_ts folder is enough. As I already mentioned CloneDVD removes the layer break. It works bor both iage and file mode stored files. You can test it before buying. Nero 6.XX seems to have problems to write DL discs (according to my experience). Keep writing speed low (For my external Plextor 716 hooked on IEEE I use only 2.4X speed).