<p>Do not mount CD. Verify if cd is mounted or not with mount command:</p>
<p class“code”># mount</p>
<p>If cd was mouted automatically unmout it with umount command:</p>
<p class“code”># umount /dev/cdrom</p>
<p>OR</p>
<p class“code”># umount /mnt/cdrom</p>
<p>Create CD-ROM ISO image with dd command:</p>
<p class“code”># dd if/dev/cdrom of/tmp/cdimg1.iso</p>
<p>Where,</p>
<ul>
<li><strong> if/dev/cdrom</strong>: Read from /dev/cdrom (raw format)</li>
<li><strong> of/tmp/cdimg1.iso</strong>: write to FILE cdimg1.iso i.e. create an ISO image</li>
</ul>
<p>Now you can use cdimg1.iso for hard disk installation or as a backup copy of cd. Please note that dd command is standard UNIX command and you should able to create backup/iso image under any UNIX like operating system.</p>
– Main.FredPettis - 04 Mar 2009