Which files will be affected?
What if I have multiple drives?
When you reset your PC, the drive will be completely reset, and all your apps and files will be removed from it. Windows 8 will be reinstalled, and you'll need to change any settings and reinstall any apps that you want to get back after resetting. If you know if any files that you don't want to lose, then you should back those files up before starting the reset.
You can choose whether to reset all hard drives or just the one with Windows 8 installed on it. Any drive that Windows 8 doesn't recognize, such as those with non-Windows operating systems, will not be affected.