Hello Nikhil,
please try to ;
strart > run > cmd
than enter
after this, type this command; chkdsk k: /f than enter. it will check your disk file system and if it find a problem, will be repaired.
in the command parameter "k:" is your drive letter.
IT Technician
The solution can helps me fixed the problem for my WD 1TB passbook as well.
Thank you once again.
Rgds, Jeff