Mac OS X This Disk doesn't use the GUID partition Scheme when upgrading to Mac OS Sierra

Solution 1:

In Disk Utility, near the close/minimize/fullscreen buttons, you can see a "View" mode dropdown menu. Set the view mode to "Show All Devices", then you'll see the "root" drives. Click on a root drive, and then click on the "Erase" button. Now an option to change the "Scheme" from Master Boot Record to GUID appears in the Erase subwindow.

Solution 2:

I think you have three alternatives.

1. Do exactly what the error says, run Disk Utility & format the drive as GUID/HFS+ instead of its current MBR/HFS+
   This is destructive & will erase all data
   [Something may have changed in Sierra, which I don't yet have - Volume Scheme is not an option in El Capitan from that tab, only from the Erase tab; so it might be worth checking out to see if it can be done on the fly now]

2. Re-clone back to the original drive as a backup, then do 1. & clone back.
   This is non-destructive but will take some time.

3. Use a Utility like Paragon Hard Disk Manager which is capable of converting MBR to GUID on the fly, non-destructively. It has a 30-day trial. I'd still recommend a backup - things can always go wrong.

BTW, CoreStorage is optional unless you intend to use FileVault or set up a Fusion drive.

Solution 3:

In Disk Utility, near the close/minimize/fullscreen buttons, you can see a "View" mode dropdown menu.

Set the view mode to "Show All Devices", then you'll see the "root" drives.

Click on a root drive, and then click on the "Erase" button. Now an option to change the "Scheme" from Master Boot Record to GUID appears in the Erase subwindow.

**If you still don't see the GUID option, unmount the disk and then erase the root drive

Now an option to change the "Scheme" from Master Boot Record to GUID appears in the Erase subwindow. **

Hope this helps

Solution 4:

For anyone else having a similar issue, this may help. I had installed a brand new 2.5" SSD into a late 2011 MacBook Pro. The Disk Utility on my macOS 10.13 installer USB would not create the proper GUID partition--the GUID option was simply not there, and macOS 10.13 would not install on a non-GUID disk. I then shut down, and used the Disk Utility on a macOS 10.12.4 USB installer, to properly partition the SSD with GUID. Then I shut down, and installed 10.13 using my 10.13 installer USB. All good here.