First of all, you need to get the unallocated disk to a proper format, then only you can use some tools for recovery
I quite agree with hell_storm200 with this point. As to the recovery programs, I think you can also try Wondershare Data Recovery. There are four modules within this file recovery
program: deleted recovery, format recovery, raw recovery and partition recovery. In your case "Raw Recovery" or "Partition Recovery" might be helpful to you.