Hello.
I've flashed via Etcher image batocera-5.21-x86_64-20190326.img in a 8GB pendrive, and then after trying to copy roms via Batocera file manager (pressing F1), I have only 128 mb available, which obviusly doesn't make sense, as the pendrive should have at least 4 GB free.
Do you have any idea what the problem could be?