A particular folder on my Western Digital 2 TB external hard disk is refusing to get deleted. The error shown is "Input/Output error". I have faced this problem before with this hard disk but it was a very long time ago and the only solution I found then was to format it. It is a strange problem because the folder has suddenly gotten corrupted for no visible reason. One of the files now has a weird character in its name (this has also happened before). Formatting the drive is simply not an option anymore because it has too much data and I have no place to back it up. Any help would be much appreciated. Thank you.