Hi, sorry for late answer. No, you can’t mount more then two discs. You can mount fist for C:\ and second for d:\
maybe this thread can help somehow
But you can have two game profiles both can start the same c:\ but you can have different d:\
For example create game profile Fallout 2 and game profile Sims. Both profiles can mount the same img with system, but each profile can mount another d: image
here are correct configurations for images:
16MB: -size 512,63,16,32
32MB: -size 512,63,16,64
64MB: -size 512,63,16,128
128MB: -size 512,63,16,256
256MB image: -size 512,63,16,520
512MB image: -size 512,63,32,520
1GB image: -size 512,63,64,520
2GB image: -size 512,63,64,1023
300MB image: -size 512,63,16,600