: Open the app, navigate to App Settings > Game Directories , and select your CHD folder.
First dump your disc to a raw ISO using ImgBurn (Windows) or dd (Linux), then run the CHD command above.
This is the command-line utility (part of the MAME tools) that handles the actual compression.
If you have a large library, look for a "Batch Convert" script.
: You must decompress the CHD back to ISO using chdman extractcd before transferring them to a PS2 internal HDD or SMB share. PCSX2 Tutorial | Video Game Emulation for Newbies
: You can extract the CHD back to the original ISO if needed for other tools. Performance