Thanks for your reply. I've got Cobra Command, Cliff Hanger, M.A.C.H. 3, Esh and other MAME games that require CHD files. I have them working on MAME. I've read that Daphne is not running Dragon's Lair on it's full potential. The images/scenes are compressed. MAME runs the laserdisc games to it's full potential. The Laserdisc games i have on MAME are 100% like the originals. I have an .iso for Dragon's Lair. Like what you said... Need to know what MAME is looking for in these .iso files to create a CHD.