My 320g wd passport detected as 2 tera

WD External Drives WD Portable Drives
2

Engr.JR,

Unfortunately, this is a sign of disk malfunction. If data recovery applications relevant to your drive do not result in a positive outcome, then you will need to contact a data recovery company to retrieve your data. We have a list of recommended preferred data recovery partners that you can use for data recovery services.

http://support.wd.com/recovery/index.asp?lang=en