Question Strange situation with my D: Hard drive after a power outage

Feb 14, 2019
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Hello I've been looking for an answer and I need your help :)

My D: hard drive is damaged and I have no idea what to do.
It happend after a power outage a few month ago.

Here are the symptoms :
Can't creat new folders nor files (Error : 0x8000FFFF)
Can't delete anything from the hard drive

Can acces all the files and open them but it's slow as hell
Can transfer the files to another internal or external drive but it's slow as hell


Any ideas ? It take 5 minutes to transfer a few mega to another harddrive I have 500Go there so it seems really impossible to transfer everything.
I've been relying on my C drive for now but I need more space....
Thanks !!!