Quote from AndroidXP :

Wow, that can only mean that the .iso file was mostly empty though. I can also make a several gig text file just containing "0" over and over and when you compress it it will be < 1KB, simply because you can write it as "1000000000 times the character 0" (aka run length encoding, one of the simplest compression methods available).

I was trying to find a mini-image, so I wouldn't have to put the DVD always in to the station to play that game (don't anymore remember what game it was) and If I remember correctly it was the whole disk, was able to install the game from the ISO when I tried. Maybe... Don't remember what the other file included.