In Unix, you list the directories in the shell for hidden files. The files might be moved to a .501 temp or .Trash directory. Check the how space is used using a df command.
Also, there are command-line tools that are good for disaster recovery even if the files are not visible or the partition is hosed. It is called Photorec. Even if the files have been erase, it will read sector by sector and recover the file based on the meta-headers. You won't get the file name but you will get the files.
Google it. Photorec