One way would be to import some new images and set the new hard drive as the destination. The new hard drive should be one of the choices in setting the destination for the import. After the images are imported, and you are looking at them in either the library or the develop module, you can right-click on one of the images and choose go to the folder in the library.
Another way would be to use your system browser to move a folder of images to the new hard drive. Then open Lightroom. It will notify you that the folder is missing. Right-click on the folder and update the folder location. Then you can find the folder on the new hard drive.