I was trying to install Ubuntu 14.04 alongside windows 8.1. So I partition 20GB using 'Partition wizard software'. But the installation fails.So I wanted that 20GB to recover. But somehow my whole F drive(245GB) is lost now. Then I tried to create new partition using windows disk management. But it is asking me to format the drive before use[image3]. So I want to backup all data in the drive. What should I do? or is there any way to recover the whole drive with the data ?