Mkv disappeared

WD Legacy Products WD TV Live Streaming
3

plug the drive into a computer. I think it will still show (via the competer) - & it is just the media player hiding the file.

Assuming this is so, via the computer, delet the .wd file from the drive (root).  Then plug in to player & should be all good again. This is exactly what happened to me once any way.

Good luck!!