Lose data in my WD passport 1TB when password protected

i have WD passport 1TB hard disk.my WD is password protected…but last day some one formated my hard drive when it password protected…so i want to know how to take back my data…WD show in disk management and it shoe’s 930GB free…i lost 800GB my data…i want to take back …any one can help me to do that/

unless you use advanced disk recovery or forensic tools (paid), I think your data is gone forever. if you’re still interested, google for such tools/services.