Problem With My Passport Ultra external hard disk by WD

I recently bought a external hard disk of WD (My Passport Ultra) 1TB. It was working fine untill now. Now there is a problem going on. I have used only 656GB of space but it now show that I have only 4GB of storage left. Earlier it was showing 257 GB of space left from 913GB but now it shows the above. I can't understand what is the problem. If anybody could guide me it would an immense help. Thank you.

Bodhiswattwa Tewari
[email address removed]
 
You might need another storage to back up your files from that drive and then cleanly wipe that drive.
 
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