Xen users - Oct 2007 - Cannot see CD or DVD drives from working WinXP guest on Fedora 7

I have built a couple of Windows XP guests on a Fedora7 installation.  
In installed the systems using  the location of my iso file in the  
install xml script,  as follows:

<disk type=''file'' device=''cdrom''>
      <source file=''/home/sources/cd_win65.iso''/>
      <target dev=''hdc''/>
      <readonly/> 
     </disk>

Once the system was running, I  changed the   script file to point to 
the CD like this:

 <disk device=''cdrom''>
      <target dev=''hdc''/>
      <readonly/>
    </disk>
I then rebuilt the domain with  virsh  define, and restarted the VM.

I cannot see the CD drive from inside the Windows VM.

I must have missed something very obvious, but I have not found a clear 
reference to this problem.

Thanks.

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