How to check if the YGO! FM ISO file is unaltered?

What is a hash?

Without going into much detail: A hash is a calculated value of the file and can be used to compare it to check if an apparently same file has been altered in any way.

How to calculate the hash of a file?

There are several tools available on the web that are easy to use. In this example I am using the "Igorware Hasher", a small and free tool for Windows. You can download it on: https://download.igorware.com/igorware-hasher-x64.rar

I've also gone ahead and prepared some verification files of an original YGO! FM ISO. Download one of them and I'll explain what to do with it in a bit. https://drive.google.com/open?id=14IS0tpPt1f24Jmc9IvlkFrOGrzWDVTTW

After unpacking the "Igorware Hasher" you start the "hasher.exe". You'll see a "Browse" button on the right, click it and point it to your YGO! FM ISO file. (e.g. Yu-Gi-Oh! Forbidden Memories (USA).bin)

If you downloaded the "Yu-Gi-Oh! Forbidden Memories (USA).sha", click on the "..." in the "SHA-1" row and point it to that file. If you downloaded the "Yu-Gi-Oh! Forbidden Memories (USA).md5", click on the "..." in the "MD5" row and point it to that file. If you downloaded the "Yu-Gi-Oh! Forbidden Memories (USA).sfv", click on the "..." in the "CRC32" row and point it to that file.

Now click the "Calculate" button on the bottom. After a short moment you will get the "Hash Result" there. If the ISO is original and unaltered it will just say that the hash is verified, if not there will be a red text saying "Done. One or more Hashes don't match!"

Voila. That's it. Easy, right?