I used to use a dj software who doesn't work in Mountain Lion.
I have a Lion virtual machine but isn't the greatest solution because the compatibility between this VM and Mountain Lion isn't optimal.
So i have decided to make a dual boot and install Lion next to Mountain Lion but i don't know and i don't find how to do it so does anyone know how to do it please ?
First, open Disk Utility, select the disk in the sidebar, go to Partition and create a volume. Then, press Command, Option and R keys on boot and install OS X in the new partition. Open System Preferences > Startup Disk to select your boot partition
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