Size after using Extract

[Moloch]

Here's my prob, I know I've had a lot of 'em but I'm still learning. I ripped the GD, in this case virtua fighter 3, when I unzip the track with eo, it says the iso is about 1 gig, when I use Extract on the ISO, it tells me all the files are around 650 megs. Am I missing files or something, or is it supposed to rip this small. After I downsample the video, it tells me it's about 350 megs total, and I only chopped around 200 megs from the video files. What gives?