WD 1tb (external) Not Recognize and unreadable

Hi razlan, welcome to the WD Community. Sorry to hear you cannot access your files. Have you tried connecting the hard drive to another PC? If the problem continues the the unit would appear to be faulty, since you need to recover your files, I recommend you to contact support first before trying to do anything else. 

http://support.wdc.com/country/index.asp