: Most units with a "2" in a circle are patched and cannot boot burned discs without hardware modification. Creating & Burning .cdi Backups
The represents a vital intersection of preservation and accessibility for Sega's final home console. While the original GD-ROM format held ~1GB of data, the community-driven CDI (DiscJuggler) format allowed for these games to be compressed and "self-booted" from standard 700MB CD-Rs without requiring a modchip. The Core of the CDI Ecosystem
Rips under 80MB (likely stripped too much), or files missing a .CDI extension.
images often feature "rips" where high-quality audio or video assets are downsampled or removed to fit the smaller capacity. MIL-CD Compatibility