When developers programmed Dreamcast games, they rarely filled the entire 1.2 GB disc. To ensure the console's optical drive could read the data efficiently, developers filled the remaining empty space with "dummy data"—essentially useless junk files that pushed the actual game data to the outer edges of the disc. The Storage Problem for Emulation
Double-click the .bat file. A command prompt window will open. dreamcast games highly compressed
Point the tool toward your .gdi or .cue file. When developers programmed Dreamcast games