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There's a cd in the tray, but we don't know who put it there. Maybe if you're logged in on a specific terminal?

I could contrive some scenarios where it would be undesirable though: Maybe if there's a rewritable (or not finalized write once) disc also in the system for something important? Let's say, a diskless system without pxe support, so it boots from a cd drive, but doesn't mount it. An unauthorized user with access to the burner could disrupt the next boot.