It works fine to determine that there are large files on the card  but the names of the files do not correspond to the file names in the """"""""""""""""My Files"""""""""""""""" application or to what I see in Windows when I connect to my computer. I have not found a way to identify which files are taking the most space. For instance  the biggest folder on the phone is labeled Apps in DiskUsage  but there's no such file I can find with either of the other two ways I know of to work with the files. The Applications folder which I can see does not contain the same subfolders as the Apps folder which I can't find in Windows or My Files.""