Ok, so today I finished building my PC, but the problem is that my HDD seems to be missing as a device. I know it works because when I installed Windows 8.1, it asked which device I would like to install it in. I chose the SSD device I have, but I also saw my HDD device as an option. Can someone please help me make sense of this, because currently I have to download things on my 128 GB SSD, which is running out of space.