OK, I had a DVD with some files on it that I had burned from a previous computer. I had it so I could still add things to it, though. I put it in my new computer and added some files, the same type as before, and after it finished burning, all the files were gone. Now, I've been doing some video editing, and when I put the video to DVD, it completes the task, but won't play in a DVD player and also, there is nothing on the DVD when placed in a computer. I can back up my store bought DVD's just fine though. What gives? Any ideas?