Third partition in Lion

Discussion in 'Windows, Linux & Others on the Mac' started by tillsbury, Jul 23, 2012.

  1. tillsbury macrumors 65816

    Dec 24, 2007
    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?
  2. vistadude macrumors 65816

    Jan 3, 2010
    I followed this guide to make a third FAT32 partition with snow leopard and xp, then i upgraded xp to windows 7. The questions is whether you need bootcamp drivers in XP, because if I remember correctly, you can't see the mac partition in windows without the bootcamp drivers, or was that the ability to read from the mac partition. If you don't need the bootcamp drivers, you could easily install XP, do the boot edit, and then do a clean install of windows 7.

    Btw, my macbook has been running nearly 3 years without corruption using this method, and I have full read/write access to the 3rd data partition in both OS's.
  3. tillsbury thread starter macrumors 65816

    Dec 24, 2007
    Yes, I saw that. But it's so old it references Snow Leopard and Windows XP (!). So it talks about a FAT32 partition. Windows 7 certainly doesn't use the same boot structure as Windows XP, and Bootcamp under Lion is different too. And they both can use exFAT drives, which looks like it's the go. But that fudge certainly isn't going to work on current software.

    What I need is the current way of doing it.... if there is one...
  4. vistadude macrumors 65816

    Jan 3, 2010
  5. tillsbury thread starter macrumors 65816

    Dec 24, 2007
    Hmm. Thanks for the links. I've seen those and they do (as you say) look very experimental indeed. I don't like Windows 7 installations over XP as they can be flawed too.

    It sounds to me from the messages on the net as if Macs just can't do this properly right now, but it might be that there is something new in Bootcamp under ML, so let's see what happens tomorrow...

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