I just added my other physical drive with Windows 10 on it to my laptop. How do I get grub to update the EFI boot options to see the Windows OS on reboot? I want to be able to select the boot OS from the GRUB menu on my EFI laptop.
For reference update-grub is a script in Ubuntu which does many things, but for this purpose it would find the new Windows OS partition and add it to the GRUB menu entry to select on boot.
I initially saw this but was unsure of the exact steps I would need to do without breaking my current GRUB boot and rendering my laptop unbootable. In other words I lack the confidence to try this out.