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The output will look like:Įrasing Disk: 0 %. The “createinstallmedia” program will erase the USB flash drive, create a new partition named “Install macOS Sierra”, and copy the installation files to that partition.
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Instead, create the USB installation drive manually using instructions from Bootable USB Flash Drive to Install Mac OS X 10.10 Yosemite. Note: If the createinstallmedia command returns a “Failed to start erase of disk due to error (-9999, 0)” error, then your current Mac OS X version does not fully support the createinstallmedia tool. The command becomes just “createinstallmedia –volume /Volumes/Mojave”. Update: For macOS 10.14 Mojave (and its predecessor, macOS 10.13 High Sierra), the createinstallmedia command no longer requires the “–applicationpath” and “–nointeraction” flags, so omit them. # You will be prompted for your user's administrative password. Sudo /Applications /Install macOS Sierra.app /Contents /Resources /createinstallmedia -volume /Volumes /Sierra -applicationpath /Applications /Install macOS Sierra.app -nointeraction # The -volume value is the mounted USB flash drive partition in this case, named /Volumes/Sierra To create the bootable USB macOS Sierra installer, run the “Terminal” application and this command: Or you can run Erase twice the first time will unmount the partition and fail, and the second time will actually do the format (which will succeed).Ĭreate Bootable USB Flash Drive Installer You can manually unmount the partition before running Erase.
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Note: If you run the macOS Sierra installer to upgrade your Mac, the downloaded file will be deleted automatically after the upgrade is completed. It will save the installer as an “/Applications/Install macOS Sierra.app” file (about 4.97GB in size).
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Run the “App Store” application, search for “macOS Sierra”, and download it.
The macOS Sierra installer is available from the Mac App Store. The best advice for installing macOS Sierra is to try again and be very patient (if you expect an operation to complete in 5 minutes, then give it at least 50 minutes).
Note: The macOS Sierra Disk Utility and installer appears to be more buggy and much slower than previous versions. These packages are not directly installable on your Mac. Ideally, when you download macOS Sierra from the Mac App Store, some raw package files will be downloaded to your computer. Download and Install macOS Sierra without MAS. This means that users that search for the installer will not find anything if they have a newer version of Mac OS. This is primarily because Apple has hidden the installer from the Mac App Store.
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How to download Mac OS X High Sierra? The best way to download Mac OS X High Sierra is via a direct link download. Below are the steps I took to create the bootable USB flash drive and how I used it to install macOS Sierra. To perform a clean installation of macOS Sierra (basically, Mac OS X 10.12), I recommend using a bootable USB flash drive containing the macOS Sierra installer.