Vista - Windows Complete PC Backup

This backup program is included with Vista Ultimate only. The backup wizard
lists the (C drive with OS, (D drive (HP's recovery partition) and (F
drive I created using Vista's Disk Management feature. Both the (C and (D
drives have a check mark which is dimmed. The (F drive has an empty box I
can check if desired. Why is the (D drive checked and dimmed? It seems I
should be able to select any non-OS drive I want to be backed up or not. Is
this a bug? Backup destination options only list the optical drive (E and
the (F partition as well. It seems the (D drive should also be listed as
a destination drive option unless the PC Backup feature is smart enough to
see there is not enough space in (D.