My WD Passport Ultra not copying files

Hi,

I bought my 2TB WD Passport Ultra on October 2016 from Amazon. Now I am not able to copy any files to it. Tried running disk check and repair. Everything stays for 4-5 hrs and then stops. Able to format it. Now it shows 1.81TB free. But unable to copy any files to it. Please help me to find a fix.

It more likely seems to be a file system issue to me.

you can give this KBA a try: