This is often due to a faulty CD/DVD disk or drive. It may help to clean the CD/DVD, to burn the CD/DVD at a lower speed, or to clean the CD/DVD drive lens (cleaning kits are often available from electronics suppliers).
Ayagi sebba-s di tegti d aḍebsi CD/DVD ixesren neɣ d ameɣri. Iwakken ad tefruḍ ugur, tzemreḍ ad sefḍeḍ aḍebsi CD/DVD, ad tserɣeḍ aḍebsi s urued anadday, neɣ ad tsefḍeḍ tiniltiyin n yimeɣri n uḍebsi CD/DVD (ttawilat n wesfaḍ wejden ɣer yimzenzuyen n dduzan ilikṭrunnanen).