title: How to access fstab at reboot phase
body: <p>How can I access and modify /etc/fstab during reboot (maybe accessing to recovery mode) ?</p>
  
  <p>Why this question :
  I have updated the virtualbox guests additions in backtrack 5 (as a Virtualbox VM).
  I have modified temporary the fstab file to do that but forgotten to turn it back to initial state, like : </p>
  
  <pre><code>mount /dev/cdrom /cdrom
  echo "/dev/cdrom    /cdrom0 udf,iso9660 defaults,exec   0   0" &gt;&gt; /etc/fstab
  </code></pre>
  
  <p>So after the guest additions installed, reboot is blocked on mounting this unexisting point.</p>
  
  <p>Thx</p>
  
  <p>edit: maybe to move to serverfault ?</p>