If you got another computer running Linux, you could take the hard drive shred it so all data on it is removed and then seeing if you can accesses it through Linux, this might work am just guessing.
I had a similar problem with my hard drive i could not accesses it due to permissions i unlocked the permissions using these commands you could try this too.
sudo fdisk -l - this will list your drives and partitions
sudo blkid - this will give you your UUID
ll /media/$USER - this will list the permissions
now you can pick if you want to make it public then you could use chmod 777 i would not recommend it tho, i did mine as admin the code to that
sudo chgrp adm (the location/ the name of the hard drive)
sudo chmod g+w the location/ the name of the hard drive)
This worked for me when i could not accesses my hard drive you could try it
if you try this make an update if it worked, if not I can try find another thing for you to open it