Lately (past few months) I've been having a lot of trouble burning DVDs. In fact, I don't think I've been able to burn any normal DVDs for a while except for dual layer DVDs. If I use disk utility or Toast to burn an ISO, I get a medium write error. If I create a burn folder to create a data DVD, it gives me some error code (don't remember the exact code off the top of my head). Any ideas?