Thanks campbrs, I was already down that path since my test environment is Virtual Server 2005, and I was also testing 64-bit PE by mounting an ISO to a iLO card in an HP server. The ISO in the Virtual machine was Volume 0, but through the iLO card the ISO was showing up as Volume 1. Most of the time, server builds will physical CD Rom drives, but I think the diskpart parsing will be more fail safe. Thanks again ...