A week ago I built a new PC, with a 1TB Seagate Barracuda and a 250GB Samsung 860 EVO SSD, then I made a mistake when installing the OS, I installed it on to the HDD as at that time, I didnt want windows to take up space on SSD where I would have my games on. However my uncle who told me about which parts I should buy only now told me that its better to have it on the SSD as my system will run 100x faster, also the Windows is licensed (actually paid 100$ for it) and want it to have the license valid if it is moved onto the SSD, it is OEM