MyPassport Error Message "Full" when it is not

WD External Drives WD Portable Drives
1

When I try to backup My Passport Ultra hard drive, it tells me it is full when the Ultra Drive picture shows it still has 806 GB free.

2

Hi there, it is possible that the drive may be corrupted. You can test the unit for defects, click on the links below for more information.

https://support.wdc.com/knowledgebase/answer.aspx?ID=940