What to do after installing macOS High Sierra?
You’ll need to restart the macOS High Sierra installation process again. If you’re still unable to resolve the problem, try booting up in Recovery Mode and using the Disk Utility option to check and repair your startup drive.
How clean install macOS High Sierra with bootable flash drive?
Create a bootable macOS installer
- Download macOS High Sierra from the App Store.
- When it’s finished, the installer will launch.
- Plug in the USB stick and launch Disk Utilities.
- Click the Erase tab and make sure Mac OS Extended (Journaled) is selected in the format tab.
- Give the USB stick a name, then click Erase.
Can macOS run from external flash drive?
You can run from a bootable USB installation of macOS just like running from an internal SSD: there’s no operational or logical difference between the two systems. But running off a USB drive is invariably slower than running off an internal SSD.
How do you do a clean install of macOS from USB?
Here’s how to format your USB drive correctly:
- Plug in the USB drive.
- Go to Applications > Utilities.
- Open Disk Utility.
- Select the drive and click Erase.
- Select Mac OS Extended (Journaled) as the format type.
Why is my Mac running slow after installing High Sierra?
A major reason for your slow Mac after its High Sierra update is that numerous applications are running simultaneously to consume vital CPU space so that the system slows down. Unwanted apps can also be toggled off to save Memory.
How do I do a clean install of High Sierra without USB?
Tutorial
- Restart your Mac, or power it on, while holding down the Command + R key combination.
- Release the Command + R key combination once you see the Apple logo on display.
- Once you see a window like the one below, click on Disk Utility and Erase your main Mac HDD (or SSD).