How do I make .cdi's and .nrg's smaller; what apps do i use and how do i use them?

[PoisenLoaf]

I need some clarification..is this what you need to do when you try to burn a .nrg or .cdi that gives you a message that it is too large to go to the CD?

I tried to burn a image of HydroThunder this morning w/ Discjuggler and it said the disc was 22 secs too large to fit on the CD. I enabled Overburn in the Advanced Tab and it went for awhile but then aborted for some reason(I do not remember the error). May have been a fluke.