sudo mv -v /home/pi/RetroPie/* /media/usb0/
pi@buster48:/media/usb0 $ ls -l /dev/disk/by-uuid/
total 0lrwxrwxrwx 1 root root 10 Nov 15 08:26 0C7F-AA7A -> ../../sda1lrwxrwxrwx 1 root root 15 Nov 15 07:34 1FAF-0B10 -> ../../mmcblk0p1lrwxrwxrwx 1 root root 15 Nov 15 07:34 a6308ae3-fdfb-4c68-b14f-ba56fb5746f1 -> ../../mmcblk0p2OurUUID is 0C7F-AA7A
sudo nano /etc/fstab
Here is what I have
and place the following line at the bottom and save
UUID=0C7F-AA7A /home/pi/RetroPie vfat rw,exec,uid=pi,gid=pi,umask=022 0 2