I have the three downloaded Mandrake 9.2 iso files mounted using the loop device. It doesn't work to mount them with the rw option. If I try to write, such as ' touch /mnt/iso1/test' I get the error message:
touch: cannot touch `test': Read-only file system
I have tried using ~/isotest/ instead of /mnt/iso1/ during testing, and also using the suid and guid options as well. Remounting with the rw option doesn't help. Looking in info mount I also noticed the rw option isn't listed for the iso9660 filetype. I was under the belief it was possible to alter mounted iso files. Is this something new, or was I wrong?

The files are located in a directory that I have write access to. ( Besides, I can't do it as root either ) I also examined the iso files with lsattr, and the immutable bit isn't used.

Here is an mtab entry for one of them to show how they are mounted:
/home/jschiwal/downloads/mandrakelinux92/MandrakeLinux-9.2beta2-CD1.i586.iso /mnt/iso1 iso9660 rw,noexec,nosuid,nodev,loop=/dev/loop0,unhide 0 0

This is my version of linux according to /proc/version:
Linux version 2.4.21-6mdk (gb@komp1.mandrakesoft.com) (gcc version 3.3.1 (Mandrake Linux 9.2 3.3.1-0.6mdk)) #1 Tue Jul 22 14:34:34 EDT 2003

Any Ideas, I hope I provided enough information.

As far as I know, you can't write to a mounted ISO. I think your best bet is to mount the ISO then copy the files to a directory. You can make your changes then recreate the ISO from the directory.

"The ISO9660 filesystem is incapable of supporting random write access,
which is the reason that DVDs and most CD-RWs use UDF (which does)."
Look into UDF.