Boot external sata Legacy gpt ssd via usb?

Date	2024-01-21 22:23 -0500
From	bad sector <forgetski@_INVALID.net>
Subject	Boot external sata Legacy gpt ssd via usb?
Newsgroups	comp.sys.laptops.thinkpad
Message-ID	<KLycnc4LV9ciQjD4nZ2dnZfqnPidnZ2d@giganews.com> (permalink)

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I'm new to thinkpads, got a T470.

1
The BIOS boot setting says "BOTH, EFI first" and Secure-Boot is 
disabled. Does that mean that it should boot either EFI or Legacy drives?

2
I wanted to just take a 2.5" gpt sata ssd from my Linux desktop and plug 
in into a usb port on the T470. That didn't work, not even with boot set 
to 'Legacy Only'.

3
Next I installed a Suse system from a DVD connected to a usb port and 
onto a sata ssd connected to another usb port. The installation went OK 
and I thought it was set up for EFI boot. But when I boot the T470 with 
this just installed system connected to a usb port, pressing 'Enter' for 
the alternative temporary boot menu, that menu never shows up (until I 
unplug the ssd from the usb port).

My preference would be to make #2 work if that's possible. Seems like 
I'm missing some bits and pieces, any experience out there?

TIA

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Boot external sata Legacy gpt ssd via usb? bad sector <forgetski@_INVALID.net> - 2024-01-21 22:23 -0500
  Re: Boot external sata Legacy gpt ssd via usb? Marco Moock <mm+usenet-es@dorfdsl.de> - 2024-01-22 09:06 +0100
    Re: Boot external sata Legacy gpt ssd via usb? bad sector <forgetski@_INVALID.net> - 2024-01-22 13:53 -0500
      Re: Boot external sata Legacy gpt ssd via usb? Marco Moock <mm+usenet-es@dorfdsl.de> - 2024-01-22 21:43 +0100
        Re: Boot external sata Legacy gpt ssd via usb? bad sector <forgetski@_INVALID.net> - 2024-01-22 15:57 -0500
  Re: Boot external sata Legacy gpt ssd via usb? bad sector <forgetski@_INVALID.net> - 2024-01-22 21:07 -0500
    Re: Boot external sata Legacy gpt ssd via usb? Marco Moock <mm+usenet-es@dorfdsl.de> - 2024-01-23 08:55 +0100
  Re: Boot external sata Legacy gpt ssd via usb? bad sector <forgetski@_INVALID.net> - 2024-01-23 23:26 -0500

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