Burn Sega Dreamcast games on Mac OS X
A common problem for Mac users, who want to burn CDI or Nero files of Dreamcast games, is that they can't use DiscJuggler and Nero. The CDI file has to be converted in order to burn it with Toast.
Here you can find a PDF File that explains how. And lots more.
(You need Adobe Acrobat Reader or a different PDF viewer.)
The PDF file recommends using UnRarX in case the whole thing is compressed as a .rar file. I rather recommend MacPAR deLuxe. It can open any valid rar file, unlike UnRarX.