I'm currently running windows 8.1 and I've decided to upgrade to windows 10 but I have to do it from the usb drive, so I bought a 16 GB usb stick to do the job. I have 2 hard drives, C: is an ssd which I use for the OS, antivirus and the drivers, then I have an hdd for everything else. Should I format the ssd before trying to install the OS from the usb stick or does it do it automatically when it boots up? I was also thinking about removing the hdd just in case the OS gets installed in the wrong drive but it might mess up some installations that I have in it like games and other softwares. This is the first time I install an OS so I'm not sure how it works, I've seen some tutorials but they're mainly for first installations and I already have a system. Any advice would be appreciated, thank you!