Has the hard drive ever been used before or is this a new installation of it?
In Windows 8, single right mouse-click the lower-left corner of the Desktop and choose Disk Management from the menu.
After a moment, Windows should populate the Disk Management console with all of the drives it has detected. Is your drive listed? If it is, what is Windows telling you about the drive?
If the drive is new, perhaps it needs to be initialized and formatted?
If the drive is not new, perhaps it has an unrecognized partition type, unrecognized format type, or is simply in need of having a drive letter assigned to a partition on that drive.