I also experienced the similar partition problem last time. I had an internal hard drive with four partitions. However, somehow, I deleted one of them somehow. But, a few days latter, I finally realized I also deleted some important files on this partition at the same time. Therefore, I tried a partition recovery program named Vimx Partition Recovery
that had eventually recovered my files back!
I get this partition recovery tool: http://www.vimxsoft.com/partition-recovery/
I was so excited about its great result that I came here to share my feeling with you and hope my words could help other person resolve their partition recovery problem.