Change disk from MBR to GUID without affecting Macintosh and Boot Camp partition?

Question

Change disk from MBR to GUID without affecting Macintosh and Boot Camp partition?

I'm currently Running El Capitan on my macbook, however, upgrading to any newer software has become impossible to a rather weird change in my disks partition sheme set up:

Instead of the usual GUID partition scheme my disk is partitioned in the Master Boot Record Sheme. Completly resetting the macbook is not an option.

How can I change the disk from MBR to GUID without loosing both my Mac as well as Bootcamp partition?

MacBook Pro 15", OS X 10.11

Gepostet am 28. März 2019 10:30

Antworten

Answer 1

02. Apr. 2019 09:21 als Antwort auf Nick_Art

Ha!

It is essentially possible to do it with a fancy program called gdisk.

The idea is to create a GPT/MBR mix of a hard drive so OSX sees it as GUID again and windows can stay happy on its MBR.

Needless to say that this is very risky and needs settings like rootless being disabled (check by typing csrutil status into terminal, it will show enabled or disabled) and chances are you will break your computer so badly only a hard reset will be able to fix it. It's still very much uncharted territory...

So if you have a similar problem, good luck to you.

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Answer 2

28. März 2019 12:24 als Antwort auf Nick_Art

This is not possible. You need an additional external disk to format it and install a new system.

External harddiscs are not expensive. 2TB drive is about 70€, see Amazon.

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Change disk from MBR to GUID without affecting Macintosh and Boot Camp partition?

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