Sorry, bud, but it's practically individual for every game. Usual method is a loop of logics, trial & error. A lot depends on certain integral game files, and what you consider to be neccesary.
Note that there might be some unneccesary files left on the CD as well.
Most newer games are un-rippable. Some older games as well.
I have done (L,T,O) rip of Earthsiege II, taking the size down to 100-odd MB (removal of Win3.x drivers, French and German language versions, extra demos, music, movies replaced with a "broken comms" one that was the smallest) from a full CD. This was done more out of pure curiosity, but worked in the end.
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"God. Can't you people see I'm trying to commit a crime against science and nature here?"
-- Reed Richards
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