Sorry,I don,t know what DTS or DD means or what DL disc are but you have given me food for thought. I am simply converting movies I have downloaded in MP4,AVI and MKV to MPG,to burn to disc to be able to play them on ordinary DVD player, Like I say BURN has no problem doing this one movie on one disc, but sometimes, one movie file is to large for one disc,which means I have to burn the end of the movie on a new disc, resulting in a waste of around 90% of the second disc, hence the reason for burning another movie on that disc,so as to use up the otherwise unused space, I don't believe this is a space issue, as BURN authorises blank DVD first to attain if there is enough space to continue with burning the movie,I have also tried burning using VOB files created by BURN with no luck, I believe it has something to do in BURNS settings to be able to continue burning with audio after first movie is complete. hope this helps a little more so you may help me a little more, THANKS.