I have six separate .iso files (Linux CentOS 5.5). They are .iso not iso.part1 or anything else and I want to combine them into a DVD. Each of them has some identical folders and files. When I mounted each of them with daemon tool and copy into another empty folder, it told me to replace the identical files and folders mutually. I'm afraid that the output dvd will not be usable when I do that. Could anyone of you please show me how to make them into one DVD? Thank in advance.