Unable to listen to CD-Rs on my 2000 ZTS Ford Focus factory issued stereo system. Reduced the write speed which I burn to x4 with some improvement.However, during the middle and end part of a audio disc, a scratching sound can be heard. Sometimes the disc refuses to play altogether and I receive an Error message (disc is dirty). I am using TDK 80min CD-R discs with affixed Fellowes Neato labeling. Plays non CD-R audio discs fine. Are CD-Rs not compatible with factory systems? Do CD labels make reading the disc difficult? Any help would be cool, thanks guys!