I remember a time when you needed to carry 30 floppies to be able to copy C&C:Red Alert... and it was worth it.
I think 9/10ths of the games I played with my brother were exploited with this trick until the warez scenes started developing proper and timely released nocd cracks.
We managed a 7-player at school, but that was using 2 discs.
Performance was terrible, but this was real 3D with a cool atmosphere. My Quake came on a CD though ... which I loved because of the included Nine Inch Nails soundtrack.
10 fps 3D action!