You’ll always need an SD card to boot from but you can move the file system to an external drive and then it all runs from there.
Check this thread:
https://dietpi.com/forum/t/tutorial-outdated-rpi-move-the-filesystem-to-a-usb-drive/317/1
You’ll always need an SD card to boot from but you can move the file system to an external drive and then it all runs from there.
Check this thread:
https://dietpi.com/forum/t/tutorial-outdated-rpi-move-the-filesystem-to-a-usb-drive/317/1