How to create third partition on a Mac with Mavericks and Bootcamp? Right now I am running OS X 10.6.8 (Snow Leopard) on my MacBook Pro, with Windows 7 via Boot Camp, and I also have a third FAT32 partition where I share data between Mac/Windows. 

I am going to upgrade to Mavericks. I Googled and it seems Mavericks is not going to be happy with letting me create the third FAT32 partition.

Did anyone create a third partition with Mavericks before? What are the steps?

(I have backed up all my data from both OS X and Windows, and I am going to format whole hard disk, and fresh install snow leopard, then update to Mavericks).
Wait, before you do that, you can do this in an easier fashion. 

Just shrink the Mac partition via Disk Utility and format the new free space as FAT32.