title: How to fix an error "Resize medium operation for this format is not implemented yet"?
body: <p>I'm trying to increase disk size of my vmdk-file. Command line:</p>
  
  <pre><code>VBoxManage clonehd "source.vmdk" "cloned.vdi" --format vdi
  </code></pre>
  
  <p>Cloned.vdi has been created successfully (45.2Gb). But then I'm writing:</p>
  
  <pre><code>VBoxManage modifyhd "cloned.vdi" --resize 60200
  </code></pre>
  
  <p>And get an error</p>
  
  <pre><code>Progress state: VBOX_E_NOT_SUPPORTED
  VBoxManage.exe: error: Resize medium operation for this format is not implemented yet!
  </code></pre>
  
  <p>Ok, I'm opening my VM VirtualBox Machine Setting -> Storage -> Adds hard disk -> Cloned.VDI. </p>
  
  <p>On the right in the information section  I have:
  Type(format): Normal (VMDK).
  It's ok? How to fix this error? I have free 110Gb of ROM on my disk</p>