I backed up all my data onto a 3TB drive with two partitions. I then upgraded my system and reinstall windows 7. I assumed that the partitions would be recognized and everything would be fine. Turns out that's not the case, I just have the one unallocated block. If I make a new volume will all my data be erased? If so, how can I recover my data? Is there a free tool? Please help ... everything is on there!