I installed a new 1t WDC HDD for my friend's computer because her old one was going out, but it's not showing up when i click on computer to check on it. I know the computer is reading it because it shows up under device manager. I also made sure that it had the right drivers and that it was working properly. I have no idea what to try next, do i have to format it somehow for it to show up under computer? or do i need to run a test of some sort?