Recover Deleted Files on Mac OSX [External NTFS]

I have accidentally deleted some files on my Mac OS X Mavericks. Actually, I was trying to burn an .img file to my flash drive which was located at **/dev/disk1** (at the same time I had connected a NTFS External Hard disk to my Mac). So I used **dd command** to flash these files and don't know how, but the flash drive was now located at **/dev/disk2** and at **disk1** the hard disk was mounted. So I accidentally flashed that .img file to my hard disk and lost around 100gb of data. Now I scanned my hard disk with Disk Drill v1 Enterprise and found some lost partitions (there are around 5 partitions around 10mb each). When I deep scan the hard disk with Disk Drill, It displays all the files but with lost file name and directory structure. But I badly need that. So guys please help me to recover these files properly based on its file structure (Like Recuva do in Windows). Also recommend me some kind of utility (free preferred) that can recover my files while keeping original directory structure.