Besides, there are many reasons to play cards.
1. It doesn't matter as long as the CD isn't spent. Maybe your DVD is not compatible. In this case, if you want to watch it easily, just take a pair of scissors and turn it in the middle of the CD. The purpose is to enlarge the circular hole (small but not too big) and enlarge the scanning axis, so as to expand the tracking operation range of the optical head, so that you can play.
2. The CD is scrapped or scratched: if it is in the central area, it will definitely be scrapped or even unreadable. But if it is not in the central area, it will not affect the reading, but it will affect the reading of individual data. There is a special repair solution, which is not very expensive, but it is very effective and can repair about 70%.