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From: druck <news@druck.org.uk>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: How to boot from SD but run from US
Date: Tue, 4 Mar 2025 21:14:29 +0000
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On 26/02/2025 04:45, Dave Vandermeer wrote:
> Actually I did read somewhere that it is possible. Technically you only need
> to use the SD card to boot to init, so modify your /etc/fstab to change the
> location of your root partition to the device of the USB drive.
> (Theoretically, I haven't booted my Pi's in quite some time.. rapidly losing
> interest in running a BBS) ..

The root filing system is determined by what is in cmdline.txt of the 
sdcard (or the FAT like filing system on the first device it finds). 
What is in /etc/fstab wont change the root filing system in use.

---druck