So, this was kind of interesting. I have Windows installed on a 500 Gb hard drive, and there's been an additional 80 Gb drive sitting inside my tower for a couple of years, collecting dust (I don't even have it assigned a drive letter in Windows).
I just bought a new SSD, which I want to eventually use as my new system drive (preliminary research has led me to guess I may want to use CloneZilla to just clone my C:\ drive onto it; does that sound right?*), and earlier today I tried installing it where that old 80 Gb dinosaur had been. Then, to my surprise, when I turned my computer on I was greeted by an error message from GRUB.
I guess ages ago I must have installed some Linux distro (honestly, I don't even remember) and gone the dual-boot route, causing GRUB to be installed on the 80 Gb so that my PC has actually been booting from that drive ever since. Then I suppose I stopped using Linux on this machine and configured GRUB to just boot Windows directly. And then I just forgot all about it.
Given that I have no interest in dual-booting (for this particular PC, I'm just sticking with Windows) OR in keeping that 80 Gb drive around, what are my options? Ideally I want to be able to just have my computer boot from the drive where Windows is installed. Is there a simple "switch boot drive" option somewhere?
*This is obviously another question entirely; feel free not to answer it.