Check the file you want to burn do you want to burn a DVD because 1 DVD has a maximum of 4,7gig space this is about 1h and 30 minutes. If you burn a Blu-Ray the size can go up to 25 gig but the movie is 1920 x 1080 pixels compare to a DVD 720 x 470 pixels also the bitrate is very low. Probably check what type of burning you try to do.