Similar entry points are defined for other architectures. The entry points on i386 and amd64 systems are: El Torito, MBR, GPT. This next step is normally the start of a bootloader system, which offers the user a menu of operating systems and is able to start the chosen one. To be bootable by computer firmware, such an ISO image has to bear special entry points where the firmware can learn about the next step to do. In all these cases the filesystem can be mounted and will show a tree of directories and files. The bytes may be brought on some medium like DVD or USB stick, or they may be exposed to the operating system as loop device. It is a list of bytes which form a readily formatted read-only filesystem. In xorriso override mounted ISO tree by particular changed files.Add overlay filesystem for doing changes.Copy full ISO directory tree to writable hard disk tree.Methods to overwrite, delete, or add files.What to do if no file /.disk/mkisofs exists.CPU architectures other than i386 and amd64, older ISOs, Debian Live.Determine those options which need to be adapted on amd64 or i386.Remove the unneeded Jigdo production options.Learn about the actually used ISO production command.Repacking a Debian ISO with its original boot equipment.
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