Anyone know why so many of the copied folders were empty on backup with roxio?

Just bought an ASUS 420 DVD ± burner. Created my first data dvd only to find that most of the files were missing. That was using Roxio DVD creator.Installed the ASUS burning software and it worked fine.

Anyone know why so many of the copied folders were empty on the disk created with roxio.? That was DVD-r media.