Compact Discs - surely you know what they are?
can hold data or music� ring any bells?
CD-Rs are recordable Compact Discs that you can use with a CD Burner (DiscRecording).
CD-RWs are re-recordable Compact Discs, that is, you can burn them multiple times.
CDs come in many different storage sizes, but usually CD-Rs will be about 800 MB. (800? Wow. I thought they were still at 700.) (You're right. They are still at 700, I just ... said 800 because... I mentioned I need to be corrected, right? Thank God I'm not posting this on a non-wiki site.) At places like BestBuy you can usually find mini CD-Rs. Most (all) CD Drives have a small indent for mini CDs, and CD Burners will work normally with them. They hold a lot (Someone editted this? a lot is the correct speeling) less information, though.
DiscRecording is the Apple API for burning information to a disc, and the overall manipulation of CDs (Reading, writing, whatever?)
You can be notified when a CD (or any other kind of volume storage) is mounted/unmouned by having an object listen to NSWorkspace's NSWorkspaceDidMountNotification and NSWorkspaceDidUnmountNotification respectively. You can also get an advance notice of an unmount via. the NSWorkspaceWillUnmountNotification notification. ^ Thank you for clearing that up, I forgot the unmount.
In most Linux systems CDs will be mounted to /devices. Obviously MacOSX isn't a linux system, as the below-editor commented. Or something.
Please correct any mistakes I made so that people don't think I'm a lier. And a bad speller.
Final editing note: DVDs are like CDs, but they hold more information, cost more, and are geared toward video. I guess that's sort of incorrect, though, because video (Vid-ay-o) is Latin for "I See", which implies there isn't any sound. - RossLeonardy
Under Mac OS X, Volume devices are mounted under /Volumes