It seemed there should be an easy way to back-up copies of data disks. Of course, one can just copy the files to the system, and then create another DVD, but it makes sense there should be a more efficient way to duplicate data disks for back-ups. I found a way that takes only two commands.
terminal commands
It appears difficult to get started without at least copying the DVD data to the drive in the form of an .iso. Still, an .iso is more efficient than copying over all of the files and creating a new iso. Start by putting the data DVD into the drive and unmount it if it auto-mounts. Next,eg:
$ dd if=/dev/hdc of=somename.isoOn some systems, this might be
$ dd if=/dev/sr0 of=somename.isoNow that we have the .iso, we can just burn as many copies as we'd like.
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