MacOS X cd detection...

[Ryan C. Gordon]

...has been rewritten to use the IOKit services. Before it would fail
unless you had a CD with an iso9660 (or "cd9660", as Darwin refers to it)
filesystem...this left out DVDs and things with a "udf" file system plus
CDs with an "hfs" filesystem (which you get when you burn a disc from the
OSX Finder). "hfs" is also the standard hard drive filesystem on the Mac,
so it was becoming clear that just checking the mounted filesystem types
wasn't sufficient. Now we look at the mounted devices and query if it's on
CD or DVD media.

I would appreciate OSX developers pulling the latest from CVS and
stress-testing it.

Thanks,
--ryan.