- Create two partitions on your drive, both using a GUID partition table.
- Format at the OS X partition as Mac OS X Journaled and the Windows partition as MS DOS FAT.
- Install Windows 7 first, but remember that there is a hidden partition (meaning your Windows partition will be partition #3 rather than #2).
- Now install Mac OS X (use our guide if you don’t know how) on partition #1 and you should be able to dual-boot problem-free.
Pretty easy! For a more in-depth look at the process, while also throwing Linux into the mix, check out our triple-booting guide.
tonymacx86 Public Service Announcement: Dual Booting [tonymacx86 Blog]