I've tried this with both PM10Free, and the PM built into BR10Compact. If I delete, create, and format partitions, it does it all in a couple of seconds. Works great. But if I tell it to mark a partition active, it takes about 30 seconds. Much longer than the other three operations combined. Why does it take so long? All that's done to mark a partition active is flip one bit in the MBR. I can actually start a sector editor from scratch and set the bit manually in less time than it takes PM to do it from the time I hit the "Apply" button. It does MUCH more work, in much less time, with the other operations I mentioned above. And it's not verifying that the files are bootable or anything, because it cheerfully marks a partition active, even if I change the partition identifier to say it's an Amoeba OS partition. So what is it doing for 30 seconds?