Hi, I randomly find your post. I am new with DAT files. I downloaded collection of roms and managed how to scan and fix roms with 'ROMvault', but I cant get it work with chd in dreamcast, saturn etc. In 'chhman' I convert roms in with multiple files to chd as you said, but it all has a different checksum and hash. How to work arount with it? TY!