I've done a few resizings on a Vista laptop and DD seems to cause something weird to happen each time I reboot after the resizing, but the net result always seems to be OK. 1. If I understand it correctly, if I simply shrink a partition, and don't have to move any files, all DD has to do is re-write a few bytes in the MBR to change the partition boundaries. Is there anything more to it than that? 2. If files need to be moved, then it just copies them inside the new partition range, and updates their entries in the file tables to indicate the new starting location. Right? So none of that sounds like it should cause any problems, but Murphy's Law is always there I guess. If I ever encounter a major problem, I guess I could just try to repair Vista with the installation DVD. I've never had to do that and have a couple of questions there too. 3. Will the repair process set everything back to the default values? Or will it retain choices I may have made in the setup? Or is it completely dependent on what it needs to repair, it might go back to default, might not?