I also used cdimageGUI earlier. Rather good tool, but then I've found better software. It's Paragon CD-ROM Emulator. Now I can create ISO images, burn them, emulate my CD/DVD-ROM, erase CD/DVD-RWs with this software only. Now I don't use cdimage GUI, Daemon Tools and Nero together as earlier. To learn more you can see its website www.cdrom-emulator.com P.S. [to Autor] It can compress images perfectly. You can decide your problem if you download demo from www.download.com.