Hi 300 I am in the same boat as you, is it ok just to cut and pasted games into the 3rd folder after unzipping? I have a 256 Gb drive and don’t have room to add all games.
I have already written the 70 Gb image file and just add the games to F drive? Where is the Mame stored, is that already in...
You don’t need to discharge if you are not disconnecting the chassis from the screen, as an electrical engineer for many years my advice is to take pics and write down, sketch every cable you disconnect.
This will save you a head ache and make sure nothing goes PoP !