title: How do I change the UUID of a virtual disk?
body: <p>I am trying to create a new virtual machine with Oracle VirtualBox, using an already-existing hard disk. When I try to select the existing hard disk file, a .vhd file, it displays an error saying the virtual hard disk cannot be used because the UUID already exists.</p>
  
  <p>So I tried the following command to change its UUID.</p>
  
  <pre><code>VBoxManage internalcommands sethduuid /home/user/VirtualBox VMs/drupal/drupal.vhd
  </code></pre>
  
  <p>I get this error.</p>
  
  <blockquote>
    <p>Syntax error: Invalid UUID parameter</p>
  </blockquote>
  
  <p>How can I resolve this?</p>