How to disable disk in bios?

Question

Hard disks

There are 2 disks, on the first Windows, on the other Linux. Where .. sorry :), when I go to the first one, I don’t see the second disk and vice versa. And so that it is completely inaccessible disk, ie. switched off.
I'm not an expert in Ubuntu and I understand that you can do things for one or two. I want to secure the main system.
How to turn off hdd/sdd in bios?

Answer 1

It depends on whether your BIOS can do it. Usually BIOS for desktops / laptops do not know how to do this. Moreover, the bootloader is most likely installed only on the first disk, and without it, Ubuntu simply will not start.
This problem is solved in different ways:

Experiment with Ubuntu on a virtual machine, not a physical machine