Hi I have replaced my HDD in my macbook succesfully. I bought an enclosure for the old drive. How can I format it to use it as an external drive? whenever i connect to a PC or the macbook the light comes on on the drive but nothing happens (well on my PC it recognises something new has been attached but when I navigate to it it says nothing is there) I have searched apples support forum and couldnt find anything and couldnt find much on here either. If there is some advice or a ink to another answer on this forum I would appreciate help!