My Passport Ultra- Passed all tests w/ Data Lifeguard and Drive Utilities but cannot add new files and says dirty disk

I am really baffled here. I bought this awesome 4 TB Drive My Passport Ultra in October to organize and go thru all my old hard drives on one external drive. It has been working great till recently I received a dirty bad disk error. I ran the WD Drive Utilities and the LifeGuard the full long tests and everything passes. I tried then uncheck and rename all the files not read only and in the middle it said dirty bad dsk again. What is going on? I cannot copy or move any files to and from this drive now. Please help someone thanks in advance

Hello,

Have you try taking ownership of the files?

See if this helps

https://technet.microsoft.com/en-us/library/cc753659(v=ws.11).aspx