Originally Posted by Rills 
I have played and finished G1-3 from the Universe pack and at no time did I ever have to have my disks in to play even once. Yes, these are legit disks and I never used no-CD fix (crack). They always loaded and I was able to play once they were fully installed.
G1 never needed the disc to play, and G3 didn't need it after the 1.6 patch. I don't remember if G2 originally needed the disc or not.