A desktop PC already runs Windows 11 on a GPT-formatted SSD with UEFI firmware and Secure Boot enabled. The user wants to add Windows 10 so either OS can be selected at startup. While booted from a Windows 10 USB installer, which installation choice will correctly configure this multiboot system without disturbing the existing Windows 11 installation?
Convert the SSD to MBR and install Windows 10 in legacy BIOS mode.
Boot into Windows 11, disable TPM 2.0, and start an upgrade installation of Windows 10.
Choose Repair your computer and run bootrec /fixmbr to add Windows 10 to the boot menu.
Select Custom installation and install Windows 10 on a newly created primary partition.
Choosing the Custom (advanced) installation option allows the technician to create or select a new primary partition that is separate from the existing Windows 11 volume. When Windows 10 is installed to that new partition, the setup program detects the current Windows 11 installation and automatically adds both entries to the Windows Boot Manager, producing a multiboot menu at startup. Converting the disk to MBR or installing in legacy BIOS mode would break the UEFI/GPT configuration, an in-place upgrade would overwrite Windows 11 instead of adding a second OS, and running bootrec commands from the repair environment does not install a second OS or create the required partition.
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What is the function of a primary partition in a multiboot system?
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Why is GPT required for UEFI and how does it differ from MBR?
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How does the Windows Boot Manager handle multiple operating systems?