7. Now, simply drag and drop your game files to the proper folder, and get ready to
The second way is via USB drive. RetroPie keeps a service running in the background
that detects when a new USB drive is inserted. The service checks for roms and game
files on the drive via folders matching the system names. The service will automatically
create the blank folders the first time you insert your USB drive. Just copy your files to
the correct folder, and they will be moved to your SD card.