"CDI" in this context usually means CDI-format Dreamcast disc images (and more broadly compressed single-file rips) gathered in large online archives (TOSEC, Internet Archive collections, preservation sites, unreleased/prototype repositories). These archives include multiple image types used for Dreamcast preservation and playback: CDI (single-file compressed rips), GDI/CUE+BIN sets (multi-track dumps), and sometimes CHD or ISO derivatives. Understanding the differences, provenance and practical trade-offs is key for preservation, playback, and using real hardware.
To understand the archive, you must first understand the format. Standard Dreamcast games were pressed on proprietary GD-ROMs (Gigabyte Discs), which held about 1GB of data—more than a standard 700MB CD-R.
What you need:
Modern Use: While ODEs like GDEMU are popular now, CDIs remain essential for those who prefer the tactile experience of physical discs or are running homebrew and recently released ports. Key Archive Repositories
In the early 2000s, "ripping" a game was an art form. Hackers had to physically hex-edit the game binaries to tell the Dreamcast to look for an MP3 file instead of a CDDA track. Sometimes these hacks were imperfect, leading to audio desyncs in emulation.
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