I have two partitions on my MAC both formatted as Mac OS Extended but only one has macOS on it. When I start the Bootcamp Assistant to install Windows 10 I get the following message:

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How to fix this issue? Do I have to erase the other partition?

  • MacBook Pro Mid-2012 using macOS Sierra – coding4fun Jul 19 '16 at 9:23
  • Funny thing is that you could have actually executed step one of my answer. – David Anderson Jul 20 '16 at 20:58

Yes, collaps the second partition into the OSX partition. After that you have one partition. Then use Bootcamp to Partition/install Windows

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