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How to Update to ML on a NO-GUID Partition


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I am successfully running OSX 10.7.4 on my E6320 in dual boot with Windows7 on a NON-GUID partitioned disk. No I wanna upgrade to Mountain Lion, unfortunately it is asking me for a GUID Partitioned disk which I obviously don't have. For 10.7.4 there was a patched install for Non-GUID Disks. Can anyone tell me if this is also available for Mountain Lion or alteratively what I have to do to make Mountain Lion work on my NON-GUID partition


Thanks in advance!

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