HT204448: About the OS X Mavericks v10.9.2 Update
Learn about About the OS X Mavericks v10.9.2 Update
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Helpful answers
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Apr 14, 2014 6:10 PM in response to Zhiling95by Niel,No, unless a problem occurs. Back it up first.
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Apr 14, 2014 6:55 PM in response to Zhiling95by GeekBoy.from.Illinois,Niel gave you the best answer.
By design, your MacOS upgrade should not impact your BootCamp at all. If a problem occurs, then all bets are off. You could lose everything. You would be best advised to make sure you have a full current backup before attempting to upgrade. The same would apply for your MacOS partition as well as your BootCamp partition.