Did you or did you not set your host controller to configure SATA as AHCI? You want to change that and be forced to reinstall Windows if you want maximum performance from your disk drives.
Say What? lol. Can you explain how to do that in detail and what pro's/con's it has?
You just have to assign your HDD a drive letter to use it. Just type "disk man" into the start menu search bar, then click on "create and format hard disk partitions" to open Disk Management. Create a partition from the raw space if there isn't one already, then assign it a drive letter.
Got it detected, format'd and assigned, thanks!