How to convert an MBR partition table to GUID on a Mac

Vlad Turiceanu
by Vlad Turiceanu
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If you own a Mac PC, then you should know that whenever you need to install your OS, your main partition needs to pe GUID (or GPR), and not MBR which is primarily specific to Windows.

Of course, there are situations when you need to convert from MBR to GPR.  These situations include:

  • Upgrading your Mac to a newer version that no longer supports MBR
  • Installing Windows on a Mac
  • Changing the PC’s hard drive, but it comes as MBR by default

Because of this, we’ve decided to make a step-by-step guide on how you can convert an MBR partition to a GUID on a Mac device.

How do I convert my MBR partition to GPR?

One thing you must keep note is that going through this procedure involves erasing your partition. That is why backing up your data is recommended.

  1. Boot from your OS X Installer Disc
  2. Choose your language and click on Continue
    • A menu bar should appear
  3. Go to the Utilities menu
  4. Select Disk Utilitymac disk utility
  5. When the Disk Utility loads select your hard drive
  6. Under the Volume Scheme heading set the number of partitions to one
  7. Click Options
  8. Set the partition scheme to GUID
  9. Click OK
  10. Set the format type to Mac OS Extended (Journaled)
  11. Click on the Partition button
  12. Wait for the process to run its course
  13. Select the freshly created volume
  14. Click on the Erase tab
  15. Set the format type to Mac OS Extended (Journaled.)
  16. Click on Security
  17. Check the button for Zero Data
  18. Click on OK to return to the Erase window
  19. Click on Erase 
  20. Wait for the process to run its course

By following these steps you should now have converted an MBR drive to a GUID (GPR) drive without any issues.

You can reverse the changes at any time by following the steps mentioned above, only this time you select MBR instead of GUID.

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