Dreamcast CDI (DiscJuggler) collections are the preferred format for burning backups to CD-R because they are modified to fit within a standard 700MB CD, whereas raw GDI images (up to 1.2GB) require an Optical Drive Emulator (ODE) or original GD-ROMs. Why CDI Collections Are Used
Seek out the "DC Revival" CDI sets or the "Better Dreamcast Project" on archive.org (still legally gray, but recognized for quality). dreamcast+cdi+collection+better
Before you start building your collection, you must understand what "CDI" actually implies for game quality. [ ] Every CDI has a corresponding source GDI noted
Here is a guide to building a high-quality Dreamcast collection. Here is a guide to building a high-quality
Plug-and-Play Hardware Support: Most Dreamcast consoles (specifically "Version 1" models) can read burned CD-Rs using the MIL-CD exploit. CDI files are pre-patched to take advantage of this, meaning you don't need to mod your console to play backups.
Fighting Games & Shmups: Genres like fighting games (e.g., Marvel vs. Capcom 2) or shoot-'em-ups (e.g., Ikaruga) often naturally fit under 700 MB.