I looked at the CD's that I was trying to burn and they are MP3's not MPu's. I did try to burn them in the data mode and cut the speed to 32 times.The same thing happened. I can only play the songs on the computer. How would I know if the CD player that I am using is MP3 compatable? What should I look for when burning these CD's to play on any of the players? I have an older one and a newer one and they will not play the MP3. As far as DVD's can you direct me to a website that can tell me the difference between the discs so I can burn and play them?