Hello, Data CD's that I have burned will work fine in my Cube running 10.2.8, as will all others. The same CD (data) is not even recognized in my old iMac/333 running 10.3.3. I do not believe that the OS is an issue, as the iMac started this behavior even when running 8.6 and I was hoping the upgrade would resolve this issue. It will play self-burned audio and "factory" CD's. I know that this is not really a Cube issue and will understand your "shunning" of me. I was just hoping that someone else may have experienced this. I have used both Toast "lite" and Titanium 5 with the same results. Thanks Be kind Bob