Naomi's gdrom supports two formats: chd and gdi. But you can't just download the chd or gdi file, you also need a .pic startup file and an eerom.bin setting file. Generally, these two files will be packaged into a .k zip package. That is to say, both the chd/gdi and the zip package are needed. 3. The key point is that the path must be correct. It is not okay to put the zip package and chd/gdi in the same folder at the same time! You need to put the zip package in a custom folder first, and then create a new folder with the same name as the zip package in the custom folder, and then put chd/gdi in this folder with the same name. Otherwise, either the chd file cannot be found or the game cannot be scanned.