Other frontends (like chdman-gui ) exist, but command-line is most reliable. a) From a folder of files (e.g., for a hard disk or CD with filesystem) This is rare. Usually you start from an existing disk image. b) From a raw disk image (e.g., .bin, .img, .iso, .raw) Basic command:

chdman info -i game.chd Example output:

| Version | MAME version introduced | Notes | |---------|------------------------|-------| | v1 | Early MAME | Obsolete, don’t use | | v2 | ~0.120 | Still seen, but old | | v3 | ~0.125 | Added FLAC support | | v4 | ~0.136 | Improved compression | | v5 | ~0.162 | Current standard |

chdman extractfloppy -i game.chd -o output.img The output will be raw, uncompressd disk image. Check if a CHD is valid and see its metadata:

chdman extractcd -i game.chd -o output.cue