I'm trying to get Drive Genius 2 to defrag my HDD. It won't work on my computer since it's can't run the utility on the current boot volume; the bootable disc doesn't work because it doesn't support the Penryn and newer computers. What I don't understand it why the program won't run off an externally install volume? In other words, I installed Leopard on an external HDD, install Drive Genius 2 and trying to run the defrag utility off of that. Since I'm running off an external I've overcome the limitation of not being able to defrag my boot volume since the internal is now an "external" volume. Anyone have any ideas?