In the world of emulation, a "ROM" (Read-Only Memory) is a digital copy of a game's data. For the Dreamcast, these are more accurately "disc images" because the original games were stored on proprietary 1.2GB (Gigabyte Disc) optical discs developed by Yamaha.
A modern favorite that compresses .GDI files without losing data. They keep your library tidy by merging multiple files into one while saving significant storage space. 2. How to Play Your Collection sega dreamcast roms
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