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Message: <blockquote data-quote="calmeforet" data-source="post: 1719505" data-attributes="member: 282580"><p>Before the "accident", I had been successfully importing CDs into iTunes: in the midst of this came the "accident",  i.e., System Preferences quit while I had the CD,DVD preferences window open.  Ever since, CDs no longer mount, whereas DVDs mount each time I reboot, but then when I try inserting a CD, neither CDs nor DVDs mount, and the CD,DVD icon disappears from System Preferences.  I have been using a USB Memorex external disc reader/burner (much faster than Apple superdrive) for several years (with older iMacs as well as with the present one, without ever having had difficulties).</p></blockquote><p></p>