Copy ROMS from external USB SD to EmuELEC - EmuELEC/EmuELEC GitHub Wiki

You can easily copy roms from any external device by using the script Copy USB roms to device in the Setup category of Emulationstation.

To do this you need to have your roms in the root of the media under roms and create an empty file named emuelec_copy_roms_from_here with no extension, like this:

USB
   /roms/nes
   /roms/psx
   /roms/snes
   /roms/(all of your rom folders)...
   /roms/emuelec_copy_roms_from_here

Insert your media and wait for it to be mounted, make sure you have enough space on the destination and select the script and follow the instructions. note that you need to select OK with button A (or B depends on your settings) do not use start as this will just cancel and exit.

After its finished copying, remove the external drive and restart your device, all of your ROMS should appear.