mkisofs can't read existing DOS file.
In backing up a Windows disk for a friend, I mounted their drive in my Mandrake 9.2 system, and ran mkisofs for the first CD's worth of directories. mkisofs terminated, complaining that it couldn't read the 49mb AOL setup.exe file in one of those directories (among several others).
The files that it complains about can all be cat'ed successfully, and show sizes and read permissions when I ls -l the DOS disk.
What don't I understand about permissions?