You do know burning these dat files, they wont run on a DVD player right?
Here's a tip, if the dat files are vcd, you can use SVCD2DVD to make dvd complaint files, or a working VIDEO_TS FOLDER FOR PLAYBACK ON DVD PLAYERS.
www.SVCD2DVD.COMExellent program. It does not reencode the video file so no quality is lost, it merely resamples the audio portion to 48000 Hz which is required to fit DVD spec.