Then you plug in the SSD, which becomes the first drive, but it doesn't have those files because it's an MBR disk with no EFI partition. Even though you are pointing to the 4TB disk when you select ...
I suffered a power outage the other day and when I attempted to boot my main computer it would not go into Windows, only the BIOS. Further investigation revealed the Samsung Evo Pro 990 1TB M.2 SSD ...