CDI too big for 80min cd

[hobojones]

I've used nero and cdrwin for backups, and now needing to use my dj 2.0.

The other image file were all smaller than the 650mb cd and i had no problem with them.

Now I am getting cdi (from dl zippped files), but the cdi is always larger than even a 80min cd:

last blade2 715mb
virtual tennis 719mb
quack attack 776mb

Is this normal for a cdi? will it fit on a 80min cd?

thanks, in advance, cool forum.