For Sega Saturn ROMs, the CHD (Compressed Hunks of Data) format is a high-performance, lossless compression tool that turns a messy folder of multiple .bin and .cue files into a single, compact file.
Here are the key features and benefits of using CHD for your Saturn collection: 1. Significant Storage Savings
Lossless Compression: CHD uses advanced compression (like FLAC for audio) that can reduce Sega Saturn game sizes by 20% to 50% without losing any original data.
Archival Quality: Because it is lossless, you can convert a CHD back into the original .bin and .cue files at any time and get a bit-perfect match. 2. "Single File" Organization
Decluttering: Sega Saturn games often come as one .cue file and dozens of separate .bin audio tracks. CHD merges all of these into one single file per game.
Easier Navigation: Using a single file makes your library much cleaner and prevents "broken" games caused by missing or misnamed audio track files. 3. Broad Emulator Support
Most modern Sega Saturn emulators and "front-ends" support CHD natively, meaning you don't have to unzip them to play:
RetroArch: Supported by most Saturn cores like Beetle Saturn and Kronos.
Ymir: A high-performance, low-latency emulator that supports CHD.
Yaba Sanshiro: Frequently used on Android and PC with CHD support. 4. Efficient Performance
On-the-fly Decompression: Unlike .zip or .7z files, which must be fully extracted before playing, CHD allows emulators to read specific "hunks" of data instantly.
Faster Loading: On devices with slow storage (like some SD cards), the smaller file size can actually lead to faster initial load times because there is less data to read from the disk. How to Create CHDs
If you have a collection of .bin/.cue files and want to convert them, you can use these tools: BIN/CUE vs CHD? Which is the best format? : r/EmulationOnPC
For Sega Saturn emulation, CHD (Compressed Hunks of Data) is widely considered the recommended file format
. It offers a space-efficient alternative to traditional BIN/CUE sets by consolidating multi-file games into a single, lossless compressed archive Key Advantages of CHD Format Space Savings : Typical Sega Saturn games can see file size reductions of 20% to 40% without any loss in data quality. Organization : It converts messy multi-BIN/CUE folders into a single .chd file , making library management much cleaner. Native Support : Major emulators and cores—including RetroArch's Beetle Saturn (Mednafen), Kronos, and Yabause
—can run CHD files directly without needing to decompress them first. Conversion Tools & Methods Most users utilize a utility called , which is part of the MAME project. LaunchBox Community Forums 1. Command-Line Method (chdman)
The Sega Saturn remains one of the most beloved consoles for enthusiasts of 2D fighters and arcade-perfect ports
. However, its library was primarily disc-based, leading to modern ROM collections that are often cluttered with dozens of files per game. To streamline your collection, CHD (Compressed Hunks of Data)
has become the gold-standard format for Sega Saturn emulation. Why Switch to CHD for Sega Saturn? Recommended ROM File Types & Compression
CHD (recommended) For Sega Saturn, you should be using CHD files. Joey's Retro Handhelds
chdman.You cannot just rename .bin to .chd. You need the official MAME tools. Do not worry—this is free and safe.
The command-line emulator that Beetle is based on. It handles CHD perfectly.
mednafen.exe "game.chd"