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I have installed BootCamp manually to the last partition on my SSD /dev/disk0s13. It works, no problems, but every time I manage my partitions from OS X (or any other OS that is not Windows), the computer creates a new hybrid MBR, which makes Windows unbootable because it can’t find the Windows partition. I have to manually remove hybrid MBR via gdisk every time I manage my partitions.

I have a MacBook Pro 2015 13" Model with 512 GBs of storage and has 6 Operating Systems installed on it. I have macOS High Sierra and OS X Yosemite installed. I mostly use High Sierra.

Is there any possible way to either stop OS X from creating hybrid MBR or force Windows to use GPT? By the way, I'm using Bitlocker, not sure if it makes a difference.

UPDATE 1: I was trying to reproduce hybrid MBR with Disk Utility, and I discovered Disk Utility no longer produces that problem. Not sure about GParted.

  • Windows is supposed to be using GPT, but for some reason it's confused when there is a hybrid MBR and is not able to find the Windows partition, therefore not booting up. – pixelomer Jan 28 '18 at 10:12
  • What you need to post is an example where the conversion to hybrid partitioning occurs. – David Anderson Jan 28 '18 at 10:24
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If you have hybrid partitioning, then Windows will only see the partitions defined in the MBR table. There is no workaround for this. High Sierra removes hybrid partitioning in favor of a fully protected MBR. Yosemite can convert to hybrid, especially if partitions 2, 3 and/or 4 in the GPT are type EBD0A0A2-B9E5-4433-87C0-68B6B72699C7.

Note: Type EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 will appear as Microsoft Basic Data in output from diskutil list.

  • I can confirm that my disk’s 3rd partition is Microsoft Basic Data. – pixelomer Jan 28 '18 at 11:08

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