Need help w/ installing Western Digital HDD

Hi, I bought an internal WD hard drive and it arrived today. I plugged in 2 cables to my hard drive (the cable that connects to the motherboard, and the cable that connects to the power supply). Then I turned on my computer and after I logged into my user account in Windows, it said that installing new driver -> driver was successfully installed. But when I go to "My Computer", I do not see the hard drive there. I restarted my computer and went into the BIOS menu and it detected the hard drive. How come I can't access/see the hard drive in Windows (only the driver)? Did I miss a step? It is my first time installing a hard drive so I am confused on what to do. Thanks for the help.

"My Computer" won't recognize the HD if it is not formatted.

Oh wow, thanks! Just went to the disk management and formatted it and its recognized now.