On 7/31/25 19:18, Eben King wrote:
I recently got some SSDs, and decided to use one of them (a 256G model)
to boot from. I want the change to be undetectable, in that from a user
perspective, nothing seems different, just faster.
I currently have a 2T HD, partitioned with GPT but booting by MBR. Yes,
that's probably weird. When I installed Debian I was unaware that the
installer would only install grub to boot using the method that the
installer booted. My BIOS/firmware will boot using either method, but
defaults to MBR if both methods work. You can force it to use UEFI on a
one-time basis. I want the SSD to boot using UEFI. Is that possible,
and if so, what's the best method to go about it?
My ideas are:
1. dd / onto the SSD, then modify it to boot UEFI. This sounds hard.
2. Install Debian (the same version I run) onto the SSD, then modify
/etc and whatever else so stuff works. This sounds error-prone.
3. Wait until I upgrade to Trixie, then let the installer hash it out.
I would go for the first option (dd), then modify grub to boot
from that, then fix the new /etc/fstab to use the correct UUID for /,
and that's it. Why do you want to switch to UEFI?
Detlef
