I assume you're talking about modifying a single-session disc/image and not just appending a new session (for which the -dev option of mkisofs will work). The mkisofs RPM package contains several utility command line programs which may be of interest to you, especially the isoinfo command (read the man page). Other commands include isodump, isovfy, and isodebug. To edit an ISO you best bet is to first mount the existing one, perhaps by something like, mkdir /oldiso mount -o loop -t iso9960 old_image.iso /oldiso Then copy everything to someplace else that's writable (use the -p option of cp to preserve timestamps, etc). Make your modifications, then use mkisofs to create a new iso image. The meta-data for the disc (such as title, volume ID, etc) can be obtained with the isoinfo command and resupplied as options to the mkisofs command. Rather than copying the entire disc just to make a couple minor changes you may instead opt to create a symlink tree and use the --dereference option to mkisofs. A little more complicated, but will use much less disk space. If you're doing this a lot with major changes, you may want to look into the unionfs filesystem, in that it allows to to merge or overlay multiple fileystems at one mountpoint. Unfortunately it's not included with Fedora so you'll have to build/install it yourself. See http://www.linuxjournal.com/article/7714 and http://www.fsl.cs.sunysb.edu/project-unionfs.html for some starting points. I also failed to mention that many esoteric features may be harder to preserve. Such as file sort order, hidden files, graft points, boot "blocks", etc. -- Deron Meranda
