When I burn DVD's, why do they become smaller?

I know this is Windows DVD Maker video resize problem, I had met the same problem before, you have to accept this problem, or use a better software to make fullscreen video DVD from your videos, then you can watch the fullscreen video DVD on your Playstation 3 without this problem(video become smaller screen size), and I used RZ DVD Creator to do that well, it can convert any videos to fullscreen video DVD, and burn to any dvd disc(DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-R DL, DVD+R DL, etc), it can resize any videos well, it supports 16:9 widescreen and 4:3 normal screen well, and provides several video resize modes, such as "stretch to fit" or "keep aspect ratio", with it you just need to select "stretch to fit", then you will get a good fullscreen video DVD, and you can watch the burned fullscreen video DVD well on your Playstation 3 without this problem, you can yahoo or google search and download RZ DVD Creator, I think it will help you alot.