I purchased the Passport Port Ultra 1 TB drive early this year and am using WD Smartware Pro 2.4.14… The backup worked well until last night. After the backup, when I tried to open the Document directory on the drive, an error message indicated the directory is corrupted and unreadable. However, other directories that were not updated during last night’s backup were accessible. Quick drive test passed. Please advise on how to solve the problem. Thanks.