I presently have 2 separate bootable USB flash drives for Mountain Lion and Snow Leopard. I'm running short of USB keys (and cash poor right now) and wondering if (a) it's worth keeping my SL bootable USB? not sure i'll ever use it again (b) is there a way to partition one of the USB keys (16gb) to hold both the ML and SL bootable installations? would it still work holding both? Thanks.