I added a card reader panel, inserted the 4T hard drive on the old computer into this computer and started win7, and then went to Microsoft's official website to upgrade to win10, because this computer has already activated win10 and bundled the motherboard, so I successfully activated the genuine win10  , the advantage of this upgrade is that all the original application software is retained without reinstallation, and then cloned back to the 512G SSD hard disk, the 4T hard disk is used for files and backups, very fast work.Thank you