Pick a drive, go to the Partition tab. Split the drive into two partitions, or whatever.
Resize the window, and watch the partitions (and total capacity of the drive) resize in accordance with the new physical size of the rectangles representing the relative size of each partition
Anyone know what happens if you format a drive after doing this? Does something screw up (like the writing of the ABL), or is this just a GUI glitch?
This is in Jag, btw - can anyone confirm its existence in Panther? (none of my Panther machines have more than one HD).