I have a late 2009 iMac running OS 10.9.5 and iTunes 12. Whenever I load an audio CD into the optical drive I get the message "The disk you inserted was not readable by this computer". The drive reads DVDs fine and an external drive running 10.10 w/iTunes 12 reads audio CDs without issue. I've repaired permissions, resest the SMC, and checked iTunes preferences all without any luck in fixing the issue. Short of downgrading iTunes, is there anything I've forgotten to investigate? TIA I should also add, that I purchased a third-party drive and it produces the same message.