Unable to locate files

My drive is unlocked. Windows assigned Drive letter D for files, and F for recovery. I did not have problem before accessing my files, but now suddenly do. Under drive D I see WD files extras & locale. But not my files.
I checked for hidden files. Nothing else is showing up. Any idea what is going on

Check Disk Management. It should let you know if your hard drive needs a new drive letter, or if it has unfortunately lost its file system.