Hi
Open Disk management (Right click "My computer" > choose "Manage" > Disk Management).
Can you see the drive there?
If there's nothing saved on the HDD >> right click it in Disk management, choose "New partition" and follow the wizard to format the drive.
If there are data you want to use - try this:
http://www.techsupportforum.com/1163140-post1.html