do you install your os on your ssd, is that safe? I usually only play at most three games at a time, so say I wanted my os, bf4, civ 5, and coh 2 on my ssd how big should I get, also is there anything else important, like different speeds of ssds, or better than sata 6gb like a card ssd etc. btw im on a budget of no more than 120 for my ssd, so if I can only have one game and os that's fine. im not even sure I need a ssd, do I, do they really help?