Making disk bootable… Copying boot files… Copy complete. If you wish to continue type (Y) then press return: Y Erasing Disk: 0%… 10%… 20%… 30%…100%… Copying installer files to disk… Copy complete. To continue we need to erase the disk at /Volumes/Flash Drive. You should see something like this in your Terminal. ( Be careful while choosing your flash drive as this process will erase the data on that specific volume) sudo /Applications/Install 10.12 Developer Preview.app/Contents/Resources/createinstallmedia –volume /Volumes/ –applicationpath /Applications/Install 10.12 Developer Preview.app You need to have a flash drive that is 8GB or above.Īll you have to do is open Terminal and enter this command and change the usbmedia with you flash drive name. While most of you may prefer installing it directly by upgrading their current EL Capitan setup others may want to clean install or create a bootable flash drive to install it on multiple Mac or have a USB installer instead. Apple recently announced Mac OS Sierra at WWDC which is currently available as a Developer Preview and soon will be available as Public Beta. is creating a bootable external drive with Install macOS High Sierra from the App Store, so that I can upgrade the internal disk to WD Blue 250GB SSD and.
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