Okay, so this is a weird situation. I have an iMac that I'm trying to burn some ISO DVDs with. Regular CDs burn with no issues (audio and data). But every time I attempt to burn a DVD, my iMac keeps giving me the "unexpected error" or "medium write error." I did a little bit of research, and some forums say it's an issue with the brand of disc. I was using Memorex. Never had issues with them before. So I decided to pick up some new discs at Best Buy... got their Dynex house brand. iMac keeps giving me the error. I did more research, and other forums are saying it may be a laser issue. But how can it be a laser issue if regular audio CDs are burning just fine? There was another forum that recommended for me to reset the SMC. I gave it a shot and attempted to burn my DVD image one last time. It worked; however, when I attempted to load the CD on a different computer, it didn't even recognize the disc! I have no idea what could be causing this. Anyone experience something similar? My iMac isn't even a year old yet.