It should be filled side-to-side. My son will be here with his Storm tomorrow and I'll see what one looks like on his. If other content fills the screen, it must be a setting or peculiarity of the content that you're converting. My LG Dare cellphone has a huge screen but does not use the entire screen for video playback, so even 4:3 has black around it. To see what DVDFab is actually producing, play the files back with VLC media player. If you don't have it, it is free and is an excellent self-contained player (no codec downloads). You can get it here: http://www.videolan.org/vlc/ . If VLC shows black bars, it is an encode setting in DVDFab. If not, then maybe a zoom setting on the BB.