Dell Optiplex GX280 and GX620 hidden partitions

We are using ZENworks 7 to image the above-named computers manually.
When restoring an image to another computer of the same model (again,
manually), we have noticed that the Dell hidden partition (with Dell's
utilities) is assigned the drive letter F instead of remaining hidden. I
then have to use Partition Magic to change this partition back to
hidden. What is the correct way to deal with hidden partitions?