Make a volume mount read-only

Rather than dig for my Mac OS X Server DVD, I find it easier to clone the disc onto a small partition on a hard drive.
However, the volume always mounts read-write, and I always get warnings about low disk space because of it. (I made the partition as small as possible.) Plus, I don't want to have anything mess with my Mac OS X Server "DVD".
I noticed that Mac OS X doesn't use fstab for mounting volumes… is there a way to make a disc mount read-only all of the time? (chmod -R a-w * doesn't cut it for me.)

I don't mean having it mount read-only when booting from it. I mean, while the server is running normally (not booted from the "disc").
For peace of mind, I'd like to have my "disc" always be read-only, just to make sure that it isn't modified unless I explicitly allow it.
On Linux, I could add "ro" to the mount options. Since Mac OS X doesn't use fstab, is there some plist that determines how volumes are mounted? I'd rather not edit the /etc/rc.* files unless absolutely necessary.

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    odysseus wrote:
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    Can anyone help me with this? When time machine tries to run a back-up I get two errors and it fails. The first says:
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    AndyPrior wrote:
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