This discussion also deals with your question.
https://community.openhab.org/t/how-to-raspberry-pi3-boot-from-ssd-install-openhab-to-usb-or-ssd-and-boot/58721
Use etcher and select SSD from “hidden drives”
This discussion also deals with your question.
https://community.openhab.org/t/how-to-raspberry-pi3-boot-from-ssd-install-openhab-to-usb-or-ssd-and-boot/58721
Use etcher and select SSD from “hidden drives”