metal gear solid substance is larger then 5GB's... Theres really no point there is only like 3 or 4 ps2 games that a DVD9. As far as I know u'll have to rip some of the content out. Unless there's a dummy file and by editing that u can alot of times cut the size down by quit abit but not all games have dummy files.
Edit:to know if a file is a dummy file it usually has a rediculous name...open it with a hex editor and see if its all dots. if it is all dots that file can be taken out and replaced with a 0kb file with the same file name ofcourse. then use cdgen to rebuild the iso.
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