GDI files are the preferred format for preservationists because they retain the specific layout of the disc, including the "high density" area and the "low density" area (an area usually containing audio tracks or system data). By archiving games in GDI format, archivists ensure that the game exists in its most complete state, allowing future emulators to accurately replicate the hardware without relying on hacked-together pirate releases.
: These contain the actual game data (Track01, Track02, etc.). dreamcast roms gdi
Here is everything you need to know about why GDI is the gold standard for Dreamcast gaming and how to use it effectively. What exactly is a GDI file? GDI (Gigabyte Disc Image) GDI files are the preferred format for preservationists