dual boot UEFI and CSM (non-UEFI)

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John

New member
Apr 30, 2024
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has anyone made a dual boot USB that both supports UEFI and CSM (non-UEFI) ?
 
Steve created this in Dec 2022: https://www.grc.com/dev/SpinRite/UEFIboot.exe

This is Steve's first attempt at this. It needs more development :) before it is ready to become an essential component of SpinRite 7.

Run it as a Windows utility to create a dual bootable USB that - in theory - will boot in either a UEFI or a BIOS /CSM environment.

My understanding is that UEFI booting does not work very well. I do not have a UEFI booting system to experiment with.

I have observed that BIOS/CSM booting works, and displays the proper message on the screen, but then always leaves the machine locked up. :(

Tip: Use a 32 GB (or larger?) USB flash drive for best results.
 
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I have observed that BIOS/CSM booting works, and displays the proper message on the screen, but then always leaves the machine locked up. :(
It's been awhile, Dan... but I suspect this was by design. My only goal was to "get there" -- but after that “my work there was done.” We as know, the December 2022 date was driven by the total and permanent end of RTOS-32 licensing at the end of that month. So I needed to quickly verify that I was willing (or not) to spent $34,000 on its source code. (y)
 
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It's been awhile, Dan... but I suspect this was by design. My only goal was to "get there" -- but after that “my work there was done.” We as know, the December 2022 date was driven by the total and permanent end of RTOS-32 licensing at the end of that month. So I needed to quickly verify that I was willing (or not) to spent $34,000 on its source code.
Right! As a "proof of concept" it was successful. It just needed more work, which was not appropriate at that time. That time will come, and this concept will become a thing of robust beauty! :) Of that I have no doubt!
 
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