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We highly recommend not installing macOS Sierra Developer Preview on a Mac that serves the purpose as a daily driver with you.

You're now set to use it on any Mac on which you wish to install macOS Sierra Developer Preview. Once you see that the process is complete, close the Terminal window and remove the USB drive from your Mac. Just grab yourself a cup of coffee and return after at least half an hour to check on the progress. We would highly recommend not touching or using your Mac at all during the entire process. The process can take quite a while so don't be alarmed. Provided you followed the steps correctly, your Mac will now start creating the bootable macOS Sierra Developer Preview USB drive.

Sudo /Applications/Install\ 10.12\ Developer\ Preview.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install\ 10.12\ Developer\ Preview.app -nointeraction &say Doneĭouble check and make sure the command line perfectly matches the one above and hit the 'Return' key on the keyboard.Ĩ. Now type in the following command exactly as shown: Assuming macOS Sierra Developer Preview is done downloading, launch Terminal on your Mac.ħ. We would recommend leaving the name of the drive to 'Untitled' as well.Ħ. Leave everything else untouched and click on the 'Erase' button. Select your USB drive from the left hand side corner of Disk Utility.ĥ. Launch Disk Utility from Spotlight or Launchpad.Ĥ. First and foremost download the macOS Sierra Developer Preview image from the Mac App Store. A Mac that doesn't crash and a little patience.ġ.macOS Sierra Developer Preview image from the Apple Developer Program website, download via Mac App Store.We're sure you have those lying around at home.

If you're planning to install macOS Sierra Developer Preview onto your Mac from scratch, then you definitely need a bootable USB drive to go about the process. The steps for doing so are absolutely simple and we'll walk you through it in a swift manner. Create Bootable macOS Sierra Developer Preview USB Drive Here's how you can create a bootable macOS Sierra Developer Preview USB drive in a few easy steps.