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Does FreeBSD not have a way to run from a flash drive in this way?
Not persistent. You can boot into an ISO of course but the flash drive won’t be able to store changes, files, etc
That's not true!! I installed FreeBSD many times on a USB stick...and of curse i can safe stuff.
Can you please share details? How do you partition the USB? How do you not overwrite the boot image? I’d like to learn.
You install BSD/Linux/Windows on a USB-stick like you install it on a SSD/HDD, it's the same...a blockdevice.
Right but how do you install it on that drive if you’re using that drive as the ISO on first boot?

I see what you’re saying but it sounds like you’re using two block devices on at least the first boot? Or am I missing something?

You use two USB sticks, on one you write the installer and during install you select the second usb-stick instead for example a SSD..that's it.

>I see what you’re saying but it sounds like you’re using two block devices on at least the first boot? Or am I missing something?

Exactly

You just need those two sticks for installation, after installation just one. NomadBSD is just a preinstalled Image +.

Yeah, that’s the difference. NomadBSD only ever requires a single blockdevice.

Using two is a minor inconvenience, but the work going into NomadBSD is pretty cool. You should check it out, sounds like you boot off flash drives pretty often.

MX Linux is awesome for persistent install on usb stick
Even more awesome for running in/from RAM(after initial boot from stick).

$ uptime 12:40:42 up 226 days, 3:42, 3 users, load average: 0.07, 0.22, 0.31