Map the USB drive into add-on with
devices options. If you need it on multiple add-ons, you can use the
/share folder which is accessible from various add-ons.
It is also possible to create an add-on that only mounts stuff to
You can format the USB device with multiple volumes and map it to a specific add-on.
share defaults to
/usr/share/hassio/share so you can mount your volumes into this folder.