So I have 1 SSD and 2 HDDs in my PC and I installed Windows 10 using the auto-install while I was sleeping. I just booted up using Win 10 for the first time and everything is super slow compared to Win 7. My SSD is my C: drive and I was using that for my OS drive but my old OS drive, a HDD also has Win 7 on it also. I didn't give much thought to which drive it would install to but now I am wondering, how do I check which drive it is running off without unplugging my drives 1 at a time?