I have a WD external drive. There is plenty files on it, about more than 100 GB of pictures and video. Then, a family member want to backup a laptop hard disk. He then copy laptop hard disk( about 40GB) to this external drive. After he finished copying, he only saw the new files which he just copy over. All those my files which is over 100GB are gone. Could you please help me to recover all my files? Even any portion of this 100GB is appreciated. Please tell me any recovery software that you have experience with. This data is more important than anything. So feel free to give me those software if they are good despite their price. Thank you very much.