: High-density GD-ROMs typically contain three or more tracks. High-quality rips use .bin for data and .raw or .wav for audio tracks to maintain 1:1 fidelity. GDI vs. CDI

Do not use CDI unless you intend to burn a disc to play on a real Dreamcast console. For PC emulation, you should only use GDI or its compressed cousin CHD (which we will discuss next).

A GDI file contains the LBA (Logical Block Addressing) numbers for every single track.

You are archiving games, using an older hardware mod that requires raw dumps, or troubleshooting a game that glitchy in other formats.

: A 1:1 copy of the original GD-ROM. Because these files can exceed 700MB, they cannot be burned to standard CD-Rs without modification. They are the preferred format for emulators like FlyCast on RetroArch and hardware modifications like the GDEMU .