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Re: Booting from an external drive

From: Pascal Hambourg
Subject: Re: Booting from an external drive
Date: Sun, 9 Apr 2017 23:01:20 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:45.0) Gecko/20100101 Icedove/45.6.0

Le 09/04/2017 à 20:14, Dale R. Worley a écrit :
I recently got into a situation where it would have been convenient to
put a "system" disk for one computer (a disk with Grub boot, a Linux
image, and the disk partitions) into an external enclosure, plug that
into a USB drive of another computer, then get that computer to boot
from the external disk.

This leads me ask these questions.  I hope that the answers are

1. Once the computer chain-loads the boot from an external disk, I
assume Grub is smart enough to fetch phases 1.5 and 2 and the boot image
from wherever it was loaded.

Stages 1.5 and 2 were specific to GRUB legacy (GRUB 1). The current GRUB version (GRUB 2) only has a boot image and a core image.

2. If grub.cfg on the external disk is written to locate the the
partition using UUIDs or other location-independent identifiers (as
opposed to sda1, etc.), Linux can boot up.


3. Is there a way to write grub.cfg to locate bootable drives attached
to USB ports, offer them in menuentry's, and chain-load them?

4. Bonus points:  Is there a way to load a USB stick with Grub and such
a grup.cfg so that one can boot a computer off of the USB stick, from
the menu, select an external disk, and get that Grub to chain-load the
Grub off the external disk?

A major problem for this is that some BIOSes do not expose all USB drives but only the one used for booting.

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