A typical .GDI "dump" includes several .bin (binary data) and .raw (raw audio or data) files. For the game to work, the .GDI file and all referenced files must remain in the same folder.
: Audio tracks (if the game uses CDDA music). When to Use GDI GDI format - dreamcast.wiki
A is a plain-text track listing used primarily for Sega Dreamcast disc images. It acts like a "blueprint" that tells an emulator or hardware where specific data and audio tracks are located across several accompanying files. Core Concept .gdi file
: A small text file (usually just a few KB) listing the tracks. Multiple .bin or .iso files : The actual game data tracks.
Best for emulation and ODEs . It is an "unripped" and uncompressed 1:1 copy of the original disc, ensuring 100% compatibility and original audio/video quality. A typical
Here is a "good feature" proposal for a hypothetical tool or emulator that handles these files:
| Format | Lossy | Preserves Gaps | Multi-Track | Emulator Support | |--------|-------|----------------|-------------|------------------| | .gdi | No | Yes | Yes | Dreamcast-specific | | .cdi | Yes | No | Partial | Broader (CD-based) | | .iso | Yes | No | No | Generic | When to Use GDI GDI format - dreamcast
You cannot "play" a .GDI file by double-clicking it in Windows. Instead, it must be loaded into specialized software:
A is most commonly associated with Sega Dreamcast emulation (specifically the GDI image format used by the nullDC and Flycast emulators). It is a disc image format similar to .cue or .iso , but optimized for the GD-ROM format.
Unlike a single-file .iso, a .gdi in the same folder with the same base name, or the emulator won't load the game.