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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 USB?
Date: Fri, 24 Jan 2025 21:38:10 +0000
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On 23/01/2025 17:42, Dennis Slagers wrote:
> Maybe this is useful
> 
> https://aroundmyroom.com/2018/07/28/update-boot-from-usb-with-hp-microserver-
> gen8-and-openmediavault/
> 
> and gives you hints
> 
> I own some HP Gen8 Microservers where you cannot boot (depends on how you want
> to use the HDD's) from the ODD port, but you can use it to have a disk
> connected to it for further use
> 
> So the trick is to boot from your SD and than tell Grub that it has to use that
> device for the rest
> so the USB disk (in my instance) was only getting start and than go further to
> the SATA
> 
> But it should not matter if that is SD or USB whatever..

This is completely inappropriate for a Raspberry Pi, which does not boot 
like a PC using grub.

> If you start chatgpt.com  ..
> and ask a question like
> 
> how to start from an SD card (initial boot) on a raspberry pi and than the rest
> through grub starting to the USB ?
> 
> you get also an answer you might be able to use

More bad advice.

See later in this thread for the actual answer.

---druck