Preparing the USB driveTo make sure your Mac device performs optimally, it is necessary to implement a clean install of the High Sierra. It is also better to use a USB 3.0 flash drive, as both the process of creating the installer USB and installing macOS from it will be faster that way. For macOS High Sierra, Apple recommends that you use a USB drive with at least 12GB of storage. That will make your Mac run blazingly fast for a few months or more, and many people report that it fixes longstanding problems they’ve had too.The first thing you need is a flash drive, of course. The idea behind a macOS Clean Install When you install a new major version of OS X, or after some time has passed, it is a good idea to do a clean install (that is, to erase the disk you are installing OS X onto as part of the installation process).
Clean Sierra Without Usb Drivers Without Needing
You can either just download the latest version of macOS High Sierra, or, if you've downloaded older versions before, find previous versions of macOS, which would be listed and available for download under the 'Purchased' tab in the Mac App Store.With that, you now have all the pieces required for creating a macOS installer USB. Select Mac OS Extended (Journaled) as the file system, and choose GUID Partition Map if asked.Next, you need to download a macOS installer from the Mac App Store. Enter a catch name, something like "macOS Installer" Select the hard drive youd like to reinstall mac OS. The macos bootcamp utility update the drivers without needing a flash driveOnce you have your USB drive, you need to wipe it, which can be done with just a few steps.I used a thing called DiskMakerX7 to create a bootable 16GB USB drive named 'Mac OS High Sierra Install Disk' It seemed to boot OK, so I selected 'Install MacOS' Now, when I boot the iMac (usb not inserted), all I get is a 4-choice menu: Restore a Time Machine Backup, Install MacOS, Get Help, and Disk Utility.This is entirely normal and allows your system to rebook running the new software with a clean slate.
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