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When GTA 3 shifted from a top-down perspective to a revolutionary 3D open-world game, Rockstar initially targeted the Dreamcast, which was dominant in the early 3D console market. According to creators, technical limitations were not the reason for the cancellation; rather, it was a commercial decision as the Dreamcast was being phased out by Sega.
In the case of Grand Theft Auto III on the Dreamcast, the CDI format enabled the game to feature high-quality audio and video, as well as fast loading times. The game was spread across multiple CDs, which were easily navigated using the Dreamcast's user-friendly interface.
has successfully ported the game to run natively on original Dreamcast hardware. The Story of GTA III on Dreamcast
The "CDI" extension refers to the DiscJuggler image format commonly used for Dreamcast ROMs. A key technical feature of these CDI files for GTA III is that they often include "dummy data" or specific CD-XA audio formatting . This was necessary to push the game data to the outer edge of the disc, allowing the Dreamcast's GD-ROM drive to read the heavy streaming data (map textures and radio audio) faster, preventing pop-in and stuttering during gameplay.