A disk with bad sectors is permanently damaged and, if the bad sectors are in use by the file system, it is very likely that data in the damaged area is unrecoverable. This can signify that your hard drive is coming to the end of its life. It is possible, however, to manage the situation and create an Image for restoring or mounting and copying files and folders. This video shows you how to run chkdsk on a problem drive to reallocate file system clusters to undamaged disk sectors: