We burn large files for backups, onto blu-ray. They are not video files. They are about 10GB. When I was using Cyberlink, it said that was too big for Joliet and told me to use UDF instead. What will happen when I try to burn a 10GB non-video file onto a Blu-ray disk with CDBXP? It will be a week before I will have another one of these large monthly snapshot files to burn, otherwise I would obviously test it now. thanks in advance, Peter PS searching for UDF in this forum yields nothing.