Click on Disk Utility in the OS X Utilities selector.Ĭlick on the Erase tab at the top of the window.Hold down Command-R when you hear the startup chime (or the screen turns black on newer Macs) and keep holding the keys until your computer reboots.Connect your Mac to the internet via Wi-Fi or Ethernet.How to create a bootable installer for macOS Big Sur.If you don't create a bootable drive for macOS Big Sur, you may have to install an older Mac operating system first and then upgrade to macOS Big Sur afterward. You'll need a copy of macOS Big Sur to perform a clean install later on. If you want to a fresh copy of Mac OS High Sierra instead, clone a copy of a fresh install of High Sierra to the external drive using SuperDuper.Step 2: Create a bootable drive of macOS Big Surīefore you erase your current operating system, download macOS Big Sur from the Mac App Store. Use SuperDuper to clone your existing copy of Mac OS to the external drive.

Note: We strongly recommend taking a full backup (Time Machine) to another drive just in case when performing these steps! Save yourself from an accident! This method uses hardware RAID and is not a software RAID. To accomplish this, you need an external hard drive and a copy of SuperDuper software in addition to your RAID 0 drives. We will use the same Mac machine (that will use RAID 0) to perform all the steps below.

In order to install the latest version of Mac OS X onto a RAID 0 slice, you must clone a copy of your Mac OS X installation straight to the RAID 0 drives (not a restore, such as Time Machine, which will not work). However, see our workaround at the end of guide. *You will notbe able to install system updates from the App Store on your live RAID volume. Until Mac OS X High Sierra officially supports RAID configurations, follow the steps below to setup a fully functional RAID 0 configuration. This has frustrated a lot of the Mac community. The latest version of Mac OS X High Sierra (10.13) does not allow you to simply install to any kind of RAID configuration.

RAID 0 is a popular disk setup solution to achieve the fastest possible read and write disk speeds by splitting data between two or more hard drives.

Clean install mac os high sierra