HT4818 I want to have an exFAT parition in addition to the Mac OS X and Windows partition.  If I create it before running BootCamp, it wants me to delete it.  If I create it in either Windows or Mac OS X afterwards, I can no longer dual boot.

I want to have an exFAT parition in addition to the Mac OS X and Windows partition.  If I create it before running BootCamp, BootCamp wants me to delete it before continuing.  If I create it in either Windows or Mac OS X after running BootCamp and installing both OSes, I can no longer dual boot.  What is the magic sequence to get this to work?

I've got the same quandary.
After upgrading my hard drive to a Momentus XT Hybrid and doing a clean install of Mountain Lion, I was surprised that I couldn't format partitions separately and then restore from my clone of the old Windows 7 Partition. I found that I had to use the BootCamp Assistant to manage it all, which essentially meant getting rid of the partitions and starting again...   
I now can't get my Windows / BootCamp partition to boot, after adding a 3rd, ExFat, partition, when it was working perfectly fine before. I just get a lot of dos booting failures and a final message that "No boot device is available, press Enter to continue".  
See the attached message, that I get when trying to boot the bootcamp partition, through Parallels 7; which also worked perfectly fine before.
Be good to know if there is a work around this in Mountain Lion as, if not, I'm thinking I might skip Bootcamp altogether and just install a machine drive via Parallels. As suggested here:
http://forums.macrumors.com/showthread.php?t=1420754
I might even keep the virtual windows machine on a separate hard drive and then I'll have no need for the ExFat partitions altogether as that was designated for  sharing between Windows  and Mac.

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