My Laptop is not detecting a Hard Drive already there?

So recently my laptop Dell Latitude E6530 started to give me problems. I knew it would happened because Hard Drive did not have a lot of space. However I did what usually everyone would, scan the Laptop using Dell Software for issues. What I came to see is that there is a hard drive in my laptop that has 289GB space! My C: drive had 78GB.

Now what I need to know why can't I see that Hard Drive? Or why can't my laptop detect or use it? Below are the screen shots.

This is the one, I'm talking about. Every where I looked for my Dell laptop specs, I found Hard drive with this much space but I thought maybe Mine just had a smaller Hard Drive:

Now this is my C: Drive

Am I missing something? I'm really confused. Please help me understand this!