My Computer can't see my 2TB HardDrive in bios but i can still use it in my computer?

So What i am saying is whenever i boot up my computer there is a black with white text screen that says something about an unconfigured hard drive that is in my computer. But then again whenever i am on my desktop doing whatever i can use it perfectly fine. Also it does not show up in the bios. it just has my boot up drive and my optical drive.

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