I am facing a peculiar problem. I hav recently bought a Sony DVD RW AW-G170A. It can write DVD without any problem. But now i hav 2 DVDs which was written by this drive but the drive cannot read the dvds. But it can read all other dvds without a problem.Then one day suddenly i discovered that my Samsung DVD-ROM SD616Q can read those two dvds without a problem.Can any one tell me how to fix the problem