![]() Power down your Mac and boot it back up with the. ![]() If you execute the startOsInstall command with -usage you’ll get a list of available parameters. With the USB installer disk plugged into your Mac and everything backed up, follow the steps outlined below. A video of the process and more details are here. “Install macOS High Sierra.app”/Contents/Resources/startOsInstall -agreetolicense -converttoapfs NO -volume /Volumes/internal Read more To make matters worse, you no longer have the option to format the disk and anything but apfs in disk utility. This clean installation will also create the Recovery HD partition. 5 Answers Sorted by: 8 To be clear, if boot from a usb high Sierra installer, and format your disk with the new apfs format, you cannot install high Sierra, you get an error that’s it not a os extended disk. ![]() Start the installation of High Sierra to the freshly formatted HFS+ volume mounted as “internal”. Go to the Volume of your attached High Sierra USB Stick.Ĭd /Volumes/“Install macOS High Sierra” Start tje omstaööatopm Installation Steps From 10.11 or 10.12 systems, format an external hard drive with at least 500gb with Mac Os Extended Journaled. Now exit Disk Utility and open a Terminal. You can create this installer following these instructions. Though the intention is to only reinstall macOS system software and not impact anything else, things can still go wrong. You should back up your Mac before beginning this process. Attach the USB stick which contains the High Sierra installer. A clean install erases everything, a reinstall does not. Format the volume HFS+ journaled and choose a simple name without spaces like “internal” (which I used for my internal SSD). You can now use the Disk Utility of the recovery OS you currently booted from to clean you complete disk. On the otherhand, the installation of High Sierra from a properly constructed bootable USB stick would also provide you with a clean install, and upon final reboot, the setup options give you a chance to restore from Time Machine, which will pull back your previous applications and home directory from the old SSD Time Machine backup. So in my case I booted from a 10.12 Sierra USB stick. ![]() Otherwise you’ll get an error message “Helpertool crashed”. Did you ever wonder how you can make a clean install on your Mac with High Sierra without being forced to use APFS? Well, I just reinstalled my mac using this method and want to explain how I acomplished this: Boot from below 10.13įirst of all, you’ll need to boot from a Mac OS Version below 10.13 High Sierra. ![]()
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