: By default, MAME looks for these folders inside your main roms folder. You can also keep CHDs in a separate folder (e.g., C:\MAME CHDs ) if you update the rompath line in your mame.ini file to include that location. Key Games Requiring CHDs
If you want to play with the big boys, follow these rules: mame chds hot
This built-in MAME utility allows you to verify, create, or extract data from CHD files if they become corrupted. Storage Warnings: : By default, MAME looks for these folders