HDD not showing up in FULLY INSTALLED High Sierra System

I've successfully installed High Sierra 10.13.1, and I have already fixed many of the issues (audio works, GPU is running, boots without USB, etc.). However, as I was checking on things, I realized that my hard drive was not being detected, although my SSD is being shown. The SSD is the only storage showing up on my system.

Note: The HDD shows up in the bios, and it also showed up in Disk Utility during the install.

Specs:

MB: Gigabyte GA-Z270X Ultra Gaming

CPU: i7-7700K

GPU: GTX 1070

Storage: Samsung 850 EVO SSD & Seagate Barracuda 1TB

Any help appreciated!

submitted by /u/mohmega
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