CD and DVD are fragile media. A few scratches here and there and they can easily become coasters on your table. I have had plenty of them myself.
Lets just look at some of the ways we can recover data from those spoilt CD/DVDs. Blu Ray & HD DVD
Anatomy of scratches
Scratches that are perpendicular (going from the center outwards) are generally less harmful or damaging than the scratches that go along the spiral. So if your CD/DVD has more of the latter ones, then the chances of a good recovery may be bleak.
recovery tool box download: