All that really matters is that you have the proper database downloaded (which should just come with the program) and that your romset matches what RetroArch is looking for.
How the scanning works are that RetroArch takes your file and runs it through a hash function. That means that if a single bit or byte in your ROM is different from what RetroArch is expecting, the hash will end up being different. So a single difference in the ROM header will throw it off. Even though the ROM might be clearly Super Mario Bros, if there is a single difference between your ROM and the ROM in the database, RetroArch can’t identify the ROM.
RetroArch looks for CPS1 ROMs
[link removed by mod] from the No-Intro romset. If that’s not the romset you have, the scanning probably isn’t going to work for most of your games.
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