If you're thinking of regular music files or something like that and not trying to modify your operating system, then you can do something like this...
I'm sort of assuming that the iso is on /dev/cdrom and the iso name is somefile.iso for this example.
mount -t iso9660 -o ro,loop=/dev/loop0 somefile.iso /mnt/cdrom
mkdir /mnt/test
cp /mnt/cdrom/* /mnt/test
umount /mnt/cdrom
cd /mnt/test and check to see if you copied things over correctly.
Copy the files to be added to the /mnt/test directory.
While in the /mnt/test directory, create a new iso image and save it to the /home directory with the command:
mkisofs -r -o /home/newfile.iso .
Now you can burn it to a cdrom with this command:
cdrecord -v speed=4 dev=0,0,0 -data /home/newfile.iso
If you meant to change the images for your operating system, that is much more complicated and you would need to do some googling for that info.
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