title: VirtualBox: mount.vboxsf: mounting failed with the error: No such device
body: <p>I'm using VirtualBox with OS X as host and CentOS on the guest VM.</p>
  
  <p>In OS X I created folder <code>myfolder</code>, added it as shared folder to the VM, turned on the VM, in CentOS created folder <code>/home/user/myfolder</code> and typing:</p>
  
  <pre><code>sudo mount -t vboxsf myfolder /home/user/myfolder
  </code></pre>
  
  <p>and have output:</p>
  
  <pre><code>/sbin/mount.vboxsf: mounting failed with the error: No such device
  </code></pre>
  
  <p>What I'm doing wrong?</p>
  
  <p><strong>UPDATED:</strong></p>
  
  <p><code>Guest Additions</code> installed.</p>