Re: DVD capacity
ISO files are not compressed - they're more like an (uncompressed) tar image of a directory tree. ISO 9660 (aka CDFS) is by design a read-only filesystem. To add even a single new file, you either need to re-master the entire ISO image (and burn to a new disc, or erase and rewrite a RW media), or ensure that you enabled support for multisession when you burned the first session to the disc. In the latter case, burning additional sessions lays down an entirely new ToC (Table of Contents), which is like a FAT for ISO 9660. There is no way to alter existing content on a disc, however existing files can be "virtually" deleted or overwritten, by the means of the updated ToC pointing to new content on the disc.
Originally Posted by unibroker
In short, I think you are making things much harder for yourself than they need to be.
Linux user since Slackware 3.4