I have 500gb HDD and all my files are there and today or later I want to buy another 512gb HDD and 128gb SSD for expansion of my storage and I want to make the new SSD as primary hard disk, so the question is, should I remove the OS in my old HDD first and put an OS to the new SSD? If yes. how to remove OS in old HDD without removing/conflicting to my files. And how to make SSD as primary hard disk?