Disc rot (sometimes referred to as disc decay) is the tendency of CDs, DVDs or other optical discs to become unreadable due to physical or chemical deterioration. Causes include oxidation of the reflective layer, physical wear of the disc, reactions with contaminants, damage from ultraviolet light, and loosening of the glue that binds the layers of the disc together.

CD rot / DVD rot causes a CD or DVD to deteriorate step by step, starting immediately after burning the discs. Our advice is not to take any risks and to transfer data and video from CDs and DVDs to other media such as USB sticks, hard disks or in the cloud as soon as possible.

More information: https://en.wikipedia.org/wiki/Disc_rot