chdman createfloppy -i input.img -o output.chd Best practice:
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: chd files for mame
roms/ gamename.zip (the parent ROM) gamename/ (folder for CHD) gamename.chd Example for Killer Instinct : chdman createfloppy -i input