So Ive ran into a problem while putting together my new pc. I have a new mobo, cpu, psu, ect. but i planned on using my old hdd with all my documents/games/pictures on it. i plan on installing my OS from a flash drive which is how ive done it before but im worried that by using my old hdd and installing the new os it will cause me to lose the data i have on my hdd. is there a way that i can avoid losing the data from my hdd and still be able to use it in the new pc?