A friend of mine dropped off a WD Portable 2TB with me that has failed, it shows in Windows as unallocated and can be seen by the 5 restore tools I’ve tried, in every case it finds loads of photos but they are all corrupted and won’t open, am I missing a trick here or is the disk finished with?
Try to create a disk image using ddrescue. Then you can try to mount the image, repair the filesystem on the image and extract files from it.
Never work directly with a bad hdd, except to image it while mounted read-only. The hdd is likely to deteriorate as you work with it.