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removing legacy boot blog post

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Valentin Boettcher 2021-11-19 13:53:06 +01:00
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@ -2920,6 +2920,31 @@ Ein wenig python verwandelte das Ganze in das neue Blog format.
Und damit koennt ihr nun unter [[/categories/neuseeland][Neuseeland]] die alten posts lesen.
[fn:5] =ctime=, creation time
*** DONE Removing legacy boot from a Linux live stick.
CLOSED: [2021-11-19 Fri 13:48]
:PROPERTIES:
:EXPORT_FILE_NAME: removing-legacy-boot-from-a-linux-live-stick-dot
:END:
I got my ThinkPad used for a bargain price but with locked
bios/uefi-setup. Annyingly, it defaults to legacy boot and there is no
way to change that.
My previous workaround was rather involved and is documented in the
[[https://wiki.archlinux.org/title/Lenovo_ThinkPad_T470#UEFI_boot][Arch wiki]]. Today however I bricked my system at work and had to
restore it in a hurry.
It turns out that you can nuke the =MBR= of the live stick to remove
the legacy boot.
**Make sure you know what the device path of the USB stick is. You
don't want to nuke some innocent hard drive :)!**
Over at [[https://askubuntu.com/questions/1100086/removing-extra-option-from-boot-manager-in-legacy-mode-after-deleting-ubuntu][stack exchange]] someone had a similar problem and one proposed
solution was to overwrite the first ~446~ Byte of the =MBR= with
zeros. Find the device path of the live stick with ~lsblk~ and then
~dd if=/dev/zero of=/dev/sdx bs=446 count=1~ as root and you're set.
* Local Vars
# Local Variables:
# eval: (org-hugo-auto-export-mode)

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+++
title = "Removing legacy boot from a Linux live stick."
author = ["Valentin Boettcher"]
date = 2021-11-19T13:48:00+01:00
categories = ["Uncategorized"]
draft = false
+++
I got my ThinkPad used for a bargain price but with locked
bios/uefi-setup. Annyingly, it defaults to legacy boot and there is no
way to change that.
My previous workaround was rather involved and is documented in the
[Arch wiki](https://wiki.archlinux.org/title/Lenovo%5FThinkPad%5FT470#UEFI%5Fboot). Today however I bricked my system at work and had to
restore it in a hurry.
It turns out that you can nuke the `MBR` of the live stick to remove
the legacy boot.
****Make sure you know what the device path of the USB stick is. You
don't want to nuke some innocent hard drive :)!****
Over at [stack exchange](https://askubuntu.com/questions/1100086/removing-extra-option-from-boot-manager-in-legacy-mode-after-deleting-ubuntu) someone had a similar problem and one proposed
solution was to overwrite the first `446` Byte of the `MBR` with
zeros. Find the device path of the live stick with `lsblk` and then
`dd if=/dev/zero of=/dev/sdx bs=446 count=1` as root and you're set.