Software for mac computers. Nov 3, 2015 - Choose OS X Extended (Journaled) for the Format, and, for the Scheme, choose GUID Partition Map. You could also choose MS-DOS as the format, if you want to be able to use the drive on both a Mac and a PC; this is helpful for flash drives, or portable USB drives. In that case, choose Master Boot Record for the Scheme.

I want to do the update to the latest version of Mac OS X Sierra. When I launch the update I get following error message: This Disk doesn't use the GUID partition Scheme Use Disk Utility to change the partition Scheme. Select the disk, choose the Partition tab, select the Volume Scheme and then click Options. It is a 2012 MacBook Pro. The original HDD was replaced with a new SSD drive a few month ago.

To do the replacement, I used Super Duper to clone the 2 drives. When I do diskutil cs list, I get No CoreStorage logical volume groups found When I do sudo gpt -r show /dev/disk0, I get start size index contents 0 1 MBR 1 1 2 976773166 1 MBR part 175 What should I do? I think you have three alternatives. • 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] • Re-clone back to the original drive as a backup, then do 1. & clone back. This is non-destructive but will take some time.

• Use a Utility like 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. 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.