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 Use a Utility like Paragon Hard Disk Manager which is capable of converting MBR to GUID on the fly, non-destructively. How to format your external drive for Mac You'll need to start with a clean thumb drive or hard drive in order to get it ready to work as a bootable drive. • Plug the USB end of the drive to a USB port on your Mac. • Click on Finder in your Dock to open a Finder window. • Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities. • Scroll down and double-click on Disk Utility. • Select your drive under External. • Click on the Erase tab at the top of the window. • Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external hard drive named 'Untitled,' you will need to rename your hard drive now. • If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the format list. • If Scheme is available, select GUID Partition Map. • Click Erase. • Click Done when the process is complete. • Close the Disk Utility window. Your thumb drive or external hard drive is now ready. How to make your external drive bootable for installing macOS High Sierra Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command. • Click on Finder in your Dock to open a Finder window. • Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities. • Scroll down and double click on Terminal. • Recall the name of your when entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/Untitled. The name of the drive can't have any spaces and it is case sensitive. • Enter the following text into Terminal ( Don't forget to change the name 'Untitled' if your hard drive is named something else): sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS High Sierra.app • Hit the enter/return key. • Enter your administrator account password. This is the password you use to make changes on your Mac or log in. No text will appear in Terminal when you enter the password. The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.' How to use macOS High Sierra with an installer boot drive Once macOS High Sierra is installed on your external drive, you can boot up and install any Mac with the drive plugged into it. • Turn off the Mac you want to install macOS High Sierra with the bootable drive. • Connect the external drive to your Mac via the USB port. • Turn on your Mac. Free windows media download for mac. • Hold down the Option key when you hear the startup chime. • Select the external drive with macOS High Sierra on it from the list of systems to start up your computer. The installation process will begin. Follow the steps to install macOS High Sierra onto your Mac or partitioned hard drive. Do you have any questions about how to create a bootable installer drive for macOS High Sierra? Let us know in the comments. Updated September 2018: Updated for the public release of macOS Mojave. 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.
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