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#11
Computer has only Windows XP HDD installed. User adds the SSD on the next available SATA port and boots from Windows 10 USB to install to it. The bios is still probably set to boot from the HDD and Windows 10 will recognize that and update the boot files contained on the HDD rather then create new boot files on the SSD. Hence the advice to only have the SSD connected during install of Windows 10. After the Windows 10 install and after the XP HDD is reconnected if the bios goes back to booting from the Windows XP HDD, the user will know it because they will boot in to Windows XP with no choice to pick Windows 10 because the boot files on the Windows XP HDD will never have gotten updated.