Istruction for partitioning an black hard-disk

HI

I would like to create an Autounattend.xml file for Vista Ultimate SP1
64-bit Retail able to completely erase partitions of a hard-disk and
to create new partitions, even if Vista sees a black hard-disk (ie a
hard disk is not formatted). How do I create this file?

I have noticed that the instruction <WillWipeDisk>true</ WillWipeDisk>
does not work with black hard-disk and, logically, this means that
other instructions of partitioning do not work .

So, regardless of hard-disk that is already partitioned or black, I'm
looking for a solution that will erase any partition and continue to
partition the hard disk following the instructions written in the
Autounattend.xml file.

Anyone have any idea what to do?

THANKS

BYE