Cannot save changes to sudoers

Linux Newbie just installed Fedora Core 5 for i386. After editing
sudoers in gedit it fails to save w/ error msg:
Could not save file /etc/sudoers
You are trying to save this file on a read-only disk. Please check
that you have typed the location correctly and try again.

I am logged-in as root. I have created other files in the /etc
directory successfully.

Questions:
1. Why won't it let me save the edited sudoers? (I'm under the
impression that as root I have authority to do anything)

2. I'm new to this forum, so if I'm in the wrong place, please point
me to the right place



Thanks

.

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