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Download mac os sierra usb installer dmg

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Back up your dataīefore backing up your data it’s always a good idea to clean your Mac first.

Patience: Obviously, this process will take some time so you need to make sure you have an hour or two to spareĪfter making sure everything is ready, it’s time to prepare your Mac for the installation.

For this reason, you need an external HD that is at least the same size as your Mac’s internal memory

External hard drive (optional): You need to back up your data to save your important files before installing the new macOS.

Make sure the installer is fully downloaded (about 5 GB)

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Good internet connection: You need to download the macOS High Sierra installer from the App Store.

Blank USB drive: You need a flash drive that has at least 16 GB of available storage space to create a bootable macOS High Sierra installer.

Requirements to create a macOS High Sierra bootable USB driveĬreating a bootable drive with a High Sierra installer is quite simple.

Installing macOS the clean way (using a non-startup drive).

Creating a bootable USB using the Terminal.

Requirements to create macOS High Sierra bootable USB drive.

It’s not hard at all, and in this article, we will guide you through:

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It makes sense to create a bootable USB flash drive to install the High Sierra operating system if you want to quickly install it on several Macs without having to download the installer each time. The app will help you delete junk, duplicates, and unnecessary apps in a couple of clicks.

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MacKeeper allows you to free up necessary gigabytes easily. You can now quit Terminal and eject the volume.Please note that before installing any system, you need to ensure there is sufficient space on your Mac.

When Terminal says that it's been completed, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur.

After the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume.

Terminal shows the progress as the volume is erased.

When prompted, type Y to confirm that you want to erase the volume, then press Return.

Terminal doesn't show any characters as you type your password.

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When prompted, type your administrator password and press Return again.* If your Mac is using macOS Sierra or earlier, include the -applicationpath argument and installer path, similar to the way this is done in the command for El Capitan. Sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app Sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume

Sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume

Sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolume If it has a different name, replace MyVolume in these commands with the name of your volume. These assume that the installer is in your Applications folder and MyVolume is the name of the USB flash drive or other volume you're using. Type or paste one of the following commands in Terminal.Open Terminal, which is in the Utilities folder of your Applications folder.Connect the USB flash drive or other volume that you're using for the bootable installer.