Use this command from Terminal: sudo mv -R "SOURCE" "DESTINATION" Supply the admin password when requested If you don't know it, the copy might work without the "sudo" command first Replace SOURCE AND DESTINATION with the correct paths Use the quotes to avoid problems with spaces in file or folder names The -R option specifies recursive, so all enclosed files and folders are copied If copying to/from another disk use /Volumes/DISKNAME/FOLDERNAME