Hi, I'm getting completely stuck trying to create a working third partition on a rMBP for use in both Windows and OSX. All the information I come across on the internet seems to apply only to old versions of OSX. As far as I can see, Bootcamp will only allow windows installation on a clean single-partition OSX system. If I shrink the OSX partition and create a new one the Bootcamp won't work. Other messages suggest installing third-party programs either to read Mac drives on Windows or vice versa. I'd really rather not do this, most appear to be only partially supported, or refer to old versions of OSX, and the one that did claim to work (MacDrive) in this situation installed and appeared to work but corrupts data on the OSX partition and is terribly slow. Fortunately that was a trial version and I had a backup of the data. I'd really rather find something that was properly supported within each OS, and that would appear to be exFAT. But creating a third exFAT partition isn't supported by Bootcamp as far as I can see (without using a third-party fudge). What's the recommended, simple way to do this? Or isn't there one? I have a 600Gb OSX partition and 150Gb Windows 7 NTFS partition. I'd like to make a 50Gb or so shared partition, for read/write data, out of spare space on either partition. Should I perhaps wait for ML to provide a better Bootcamp implementation?