I have never had this problem before- I am working on an image and when I tried to save it to my external hard drive it said "could not save as because of a disk error". the hard drive has 2/3 memory left, but the message isn't about memory. I have since saved to desktop and quit and reopened the application but I get the same message when I try to save to the disk.
I have also browsed the Adobe support forums and seen other people answer this question with going to settings and granting photoshop Full Disk Access permissions. However, I have already done this. Notably permissions only go to Photoshop Beta, although I have both installed on my computer. However I get this error message regardless of which version of photoshop I use to save the image.