When the Dreamcast hacking scene began, enthusiasts needed a way to backup games and play them on emulators (like nullDC or Chankast) or real hardware via SD card adapters. CDI became the standard because DiscJuggler was one of the few programs that could accurately burn the specific "session" structure required for the Dreamcast to recognize a disc.
If you want, I can:
A curated set specifically for burning to physical discs. sega dreamcast cdi archive
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