Scratch Disks full

I have serach long and hard for this and done everything its told me to do, but nothing. First when i ctrl alt when startup and change it to my D:/ which is my hd is does not save that nor does it show up when photoshop does happen to open in preferences/scratch disks it only shows my C:/ which is my ssd I really need help cause this is really frustating ive been at this for a couple days and nothing