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Currently I have Windows 10 installed on a SSD; now I'm about to add a new SSD and I want to install Ubuntu Mate on it.

As far I understand the Grub will make a dual boot in this second SSD so the BIOS must set it up to boot with this second SSD. If I remove the Linux SSD the BIOS will boot with the first SSD and Windows 10 will not notice any difference.

I'm right? The Grub doesn't change the first SSD?

What I want is if both SSD are connected the GRUB will take control and if only the current SSD is connected Windows 10 boot as is doing it now.

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Whatever is the boot partition, be it BIOS or UEFI, the boot partition is one and only one. After booting from it, the boot software will evoke the bootloader for the chosen operating system from its installed disk.

Note that a UEFI computer does not need Grub to be installed, as the multi-boot is done by the firmware, using the EFI partition.

So the answer is that only the non-boot disk can be removed.

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  • How do I know if the boot is UEFI or BIOS? I don't want to change the Windows 10 boot, so I think I will install Linux without the Windows SSD connected and will plug the proper disk before turn on the PC.
    – E_Blue
    Commented Sep 12, 2021 at 13:03
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    Yes, that will work of course. As requested, to find out your boot type, run "System Information" and look at "BIOS Mode", which will be Legacy or UEFI.
    – harrymc
    Commented Sep 12, 2021 at 13:07
  • Thanks, it seems is running in UEFI mode.
    – E_Blue
    Commented Sep 12, 2021 at 13:10

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