I was instructed in one of the threads on here to make an alias to the folder on the usb drive containing the roms and just replace the folder in the retropie roms folder with the same named alias. That also works. One thing that I like about that is I could at any time just delete the alias and replace with a folder to return it to reading off the sd card, or you could have part of a folder on the usb and part on the sd (if you don’t mind having two subfolders in ES).
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