hard drive detection

Update I reseated the Seagate Barracuda and the WD Black and now they're both detected in BIOS. I was able to initialise the WD Black in Disk Manager, but the Barracuda isn't showing up for some reason. The Barracuda was initialised prior to getting the WD Black, but i moved it over to the...

So i have an ASUS HERO MAXIMUS XI WIFI and I've flashed the bios on it before. I've checked all of my connections in the PC, being that the drive is 100% being detected in multiple places on my hard drive. The hard drive that wont be detected is a WD Black 4tb. And again, it shows up in my...