External device

ResinOS / Generic

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 share.

You can format the USB device with multiple volumes and map it to a specific add-on.

Generic

The share defaults to /usr/share/hassio/share so you can mount your volumes into this folder.