Burner new LG unit, disks DVD-r. Also have a DVD read onlt drive on board. Seems to read OK, takes about 35 min, then the write seems to take only about 15 minutes, then finalizes. Whatever it writes does not play. When comparing files it seems to be missing a few from the original disk. Has a load of VTS files and video files, the largest are 3 at about 1,048,000 bytes. Any ideas to start.