Pro: I can't delete the files inside...

I need to delete all the contents of my MyPassport W Pro. I can’t do it from the Finder and not even via http: //mypassport.local/UI/ Anyone have any idea what happened?

If you want to delete all the contents in you drive, just plug the drive direct to your computer using the USB cable. From the computer side format the drive. Everything files/folder will be lost.