You need a specific tool to make the USB bootable. see here - click here
I presume you have an unused licence key ready for use, the one from existing PC may not work as it "is already in use" when you try to activate.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.