Maybe because of Burning Software ,I used to Nero Buring Rom 7 and I am facing that kind of problem ,can read and burn DVD but not CD-R or CD-RW. I upgraded my Nero to version 8 and My drive can read and burn DVD or CDs.
Sometimes,we got annoy when we know our saved jpegs are damaged but don't know how many of them . You can find it by using this software Bad Peggy by Markus Hahn