So basically, I have all of my steam games installed and running off of my current HDD. I just recently bought a 250GB SSD that I want to run just some of my steam games off of. Do I need to install an operating system onto the SSD in order for it to run the few games I want to play while still having my HDD plugged in or does having the HDD with the OS on it make it so all I have to do is re-install my games I want onto the SSD. All I want the SSD to do is run some of my games, and I want my HDD to still have all of my files and stuff on it, including Windows. Can anyone clear this up for me?