title: Why moodledata directory has this structure?
body: <p>I know moodle's internal files such as uploaded images are stored in <code>moodledata</code> directory.</p>
  
  <p>Inside, there are several directories:</p>
  
  <pre><code>moodledata/filedir/1c/01/1c01d0b6691ace075042a14416a8db98843b0856
  moodledata/filedir/63/
  moodledata/filedir/63/89/
  moodledata/filedir/63/89/63895ece79c4a91666312d0a24db82fe3017f54d
  moodledata/filedir/63/3c/
  moodledata/filedir/63/37/
  moodledata/filedir/63/a7/
  </code></pre>
  
  <p>What are these hashses?</p>
  
  <p>What are the design reasons behind this design, in oposition with, for example, wordpress <code>/year/month/file.jpg</code> structure?</p>