Visual characteristics of CDs and DVDs

The visual characteristics of CDs and DVDs have to be checked alongside the geometric characteristics.

Characteristic	Problem
Scratches	Scratches on the CD or DVD disrupt playback. Deep scratches on the medium can lead to read errors. In the worst case, the entire content of the CD is not read.
Burned CD	In the case of poor-quality CD blanks, the geometric specifications are not always met. The quality of the CD can be impaired when CDs are created at home.
Burned CD with label	The increased temperature in the drive can make applied labels come unstuck and lead to damage. An applied label changes the thickness of the CD. This change must be checked against the geometric characteristics.