I have two peoblems.
The first and more irritating one is that it reads 3/4 of full DVDs as blanks. I repeat not all of them but the majority. It wasn't always like this. Last summer I bought a new computer and the guy at the store put into the new one this DVD-Rom and the hard drive from my previous computer. I never had this kind of problems before.
The second problem occured while burning. I was burning a DVD and it reported an error. Now it works really slow. It burns a DVD in 50 minutes, copying files from a DVD takes ages and while I do one or the other everything slows down. I can't watch movies, can't listen to music, can't do anything.