Home Assistant Yellow - configuration options before completing onboarding?

Hi, quick one here:

I am gifting a Yellow with m.2 drive.
I’m wondering if you get the usb to install home assistant OS and connect up the serial port, can you use the ha os commands to set the data drive without going to the UI and creating a user?

Bonus points: can you get the Ethernet MAC address this way as well? I was surprised not to see it printed on the board…

Thanks all!

Perhaps to break the problem space down a little more to be distinct questions that on their own are more useful for others to know, to make this worth answering…

So…

  1. Once you’ve installed Home Assistant OS, but before you do the onboarding steps at HomeAssistant.local, can you log in via the console?

  2. Can is there a command you can use in the console to set up a Data Drive? Or is that only available in the UI?

  3. If the answer to Q1 is yes, do changes you make persist after a reboot, or are they discarded when you shut down (or overridden when you complete the onboarding)?