. For systems like PS2 or Xbox, these can be directly used as ISOs or converted using additional tools like 2. Core Command for Extraction
A simple text script helps automate the process if you have multiple files to convert.
If you are building a massive library of repacks, converting files one by one is highly inefficient. You can automate the entire process using a simple Windows batch script. How to Create a Batch Conversion Script Open on your computer. Paste the following script into the blank document:
Here's a step-by-step guide to converting CHD to ISO: convert chd to iso repack
Place chdman.exe and your .chd file into a dedicated folder (e.g., C:\Convert\ ).
Download the latest MAME binary package from the official MAME website. Extract the contents and locate chdman.exe . 2. Prepare Your Files
If CHDMAN throws an error stating it cannot read the file or that the "header is invalid," the CHD file was likely built using an ancient version of CHDMAN (such as v4 or older), or the download itself was corrupted. You will need to verify the integrity of the file or source a clean copy before attempting to unpack it again. Next Steps for Your Repack Project If you are building a massive library of
: Get the latest MAME zip from the MAME website, extract it, and find chdman.exe .
Press . The tool will begin decompressing the sectors. Once the progress bar reaches 100%, a fresh, uncompressed ISO file will appear in your folder alongside a .cue file if the original game contained multiple audio tracks. Method 2: Batch Converting Multiple CHDs to ISO
While CHD is excellent for saving hard drive space, you may need to convert these files back to ISO format to create uncompressed "repacks," apply translation patches, or achieve compatibility with specific emulators. Understanding the Formats: CHD vs. ISO Paste the following script into the blank document:
Converting CHD to ISO is a straightforward process once you have the right tool. For most average users, the method or the CHDroid Android app will be the easiest path forward.
Wait for the progress bar to hit 100%. Your new, uncompressed ISO will appear in the folder.
If you are still having trouble, please check the Recalbox Wiki for more information.
command-line utility. Since CHD is a "lossless" container, the extraction process involves decompressing the "hunks" back into a raw image format (BIN/CUE or GDI) and then repacking those into a standard ISO if necessary. Primary Tool: MAME CHDMAN utility for the core extraction. Target Logic: typically extracts to
for i in *.chd; do chdman extractcd -i "$i" -o "$i%.chd.iso"; done