title: [Qt][Linux] List drive or partitions
body: <p>How I can list drives or mounted partitions using qt?
  I tried to use: </p>
  
  <pre><code>foreach( QFileInfo drive, QDir::drives() )
         {
           qDebug() &lt;&lt; "Drive: " &lt;&lt; drive.absolutePath();
         }
  </code></pre>
  
  <p>but it shows just root drive.
  I also noticed that length of QDir::drives() is 1 but QDir::Drives is 4.</p>