for i in *.cue; do chdman createcd -i "$i" -o "$i%.cue.chd"; done
To run a desktop-grade command-line utility on Android, you need a few free tools from the Google Play Store or trusted open-source repositories:
For using on Android, the most comprehensive guide is the definitive CHDman guide on Reddit , which details how to use Termux to compress ROMs directly on your device. Top Ways to Use CHDman on Android chdman android
Select your output directory (where you want the .chd files saved). Tap or Start .
is a popular topic among mobile emulation enthusiasts. It refers to using the Compressed Hunks of Data (CHD) manager tool directly on an Android device to compress large disc-based game files into a highly efficient, space-saving format . for i in *
For a deep dive into the compression format itself and its benefits for retro gaming, the is an excellent resource.
Developed as part of the MAME (Multiple Arcade Machine Emulator) project, CHDMAN is the official utility for creating and managing files in the CHD format. "Compressed Hunks of Data" is more than just a name; it describes the format's core function. Unlike standard ZIP or RAR compression, which treats a file as a single block of data, CHD divides a disc image into many small, manageable "hunks". This design, combined with the use of powerful compression algorithms like LZMA and Zstandard (zstd), often achieves compression ratios that are impossible with conventional archivers. This method is particularly effective for optical disc images, as the format can efficiently manage the multiple data and audio tracks that are common in games from this era. is a popular topic among mobile emulation enthusiasts
If typing commands into a terminal feels too intimidating, there are community-made graphical interfaces (GUIs) available for Android that wrap chdman into a standard app interface.
chdman --compress /storage/emulated/0/MAME/roms/game.chd /storage/emulated/0/MAME/roms/game.chd.gz
The tool will read through the file and report any integrity issues.
: Execute the accompanying .sh script to parse your directories and automate the compression process without typing out arguments. Comparison: Raw Formats vs. CHD Raw Format ( .bin / .cue , .iso ) Compressed Format ( .chd ) Storage Footprint Extremely High Low to Medium (Compressed) File Structure Often split into dozens of audio tracks Unified into a single file Android Compatibility Universal across all apps Supported by all major modern emulators Load Times Identical (or faster due to less disk I/O) Crucial Tips for Success