title: how to low-level format a hard disk using AIX?
body: <p>I have a server with AIX 6.1 , I formated some hdisks using diag tool, but in some way some of its VGDA survived.</p>
  
  <p>how may I low-level format a hard disk using AIX?</p>
  
  <p>or</p>
  
  <p>how may I clear the VGDA of a specific hdisk?</p>
  
  <p>thanks</p>