I recently used Disk Director for the first time, to resize my system partition. Briefly: My hard disk has two partitions. C: is my system partition and D: is my data partition. In order to make C: bigger I shrunk D: by the corresponding amount. What surprised me - happily - is that Disk Director resized my system partition without needing to restart my computer. How can Disk Director resize a partition currently in use? Is this for real or is Disk Director using some 'trick' that's going to come back to haunt me in future?