My external western digital hard drive has worked perfectly in the past. I used it to backup my computer when switching from xp to 7 and ever since then i can not see the files even though when i go to the properties it still says the space is used. (its 1T and amount used but invisible ~2gb) The rest is empty. How do i get these files visable again? I tried searching for hidden files and it didnt work either. I have tons of important pictures, videos, and documents and need to get them back. Im hoping not to have to do an expensive data recovery service.