I just tried backing up my first DVD, and everything went fine until CloneDVD went to write to my DL DVD. It said the selected media did not have enough space. The total size for the VIDEO_TS folder was 7.2 GB, well under the DVD-9 spec. I ended up just using another piece of software (CopyToDVD) to burn the disc, but really want to do it all in CloneDVD.
Any idea why it was saying this and will not allow me to burn the DL DVD+R??