High Sierra Install Usb

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MacOS High Sierra; For an OS X El Capitan installation, the file gets saved as a disk image named 'InstallMacOSX.dmg'. To install, open the disk image and run the installer named 'InstallMacOSX.pkg'. I just install macOS High Sierra and Windows 10 through BootCamp Assistant. The problem is that, Windows have a strange issue and I need a bootable USB to go to the recovery mode. I tried to make one from BootCamp Assistant but in the latest macOS the process is different and there is nowhere the ' Create a Windows 7 or later version install. To install High Sierra from a USB using your startup disk drive: 1. Go to System Preferences. Click on Startup Disk and select the installer. Restart your Mac. Hold down Command (⌘) + R to boot into recovery mode. Connect your macOS High Sierra bootable USB. Within a few seconds, a macOS Utility screen should pop up.

Create

Once finished you can plug the USB stick into your MacBook Pro and install a clean copy of High Sierra, Mojave, or Catalina. Make sure to format the drive with the APFS filesystem, because this is optimized for SSD and NVMe media.

To create a MacOS High Sierra bootable USB drive, you would need to follow some steps:

First all you are needed to fulfill some needs.

  1. You need a USB that has a storage of at least 16 GB as this space will be used to store the bootable MacOS High Sierra installer.
  2. The MacOS High Sierra installer is a file that has a size of more than 5GB. So, you are required to have a good and stable internet connection in order to download this file quickly.
  3. You need to have an external hard drive in which you can keep a backup of all the data that is currently stored on your Mac. This hard drive should be of the same size as of your Mac’s hard drive.

Create a backup

Once you have fulfilled all the requirements, you would need to start the process by backing up your data.

Before backing up the data, it is recommended that you use a cleaning application that would clean your Mac because overtime lots of junk files would stack up in your Mac and once you install the new Mac OS, it would not perform to its full capacity because of the existence of such files.

You can manually delete these files, but it would take you lots of time to locate these files. It is recommended for you to use a cleaning application like cleanmymac x.

Cleanmymac x is a popular cleaning application that would remove blocks of junk data from your Mac in just a few clicks.

  • The first step to carry out is to install cleanmymac x application.
  • Once the application has been installed, open it.
  • When the application has been launched, you will be greeted with a welcome page.
  • At the bottom of this page, you will see a scan button.
  • Press this scan button. Now cleanmymac x would begin to Search and delete all of your junk files. After this it will run a protection scan to Search and remove all the malware from your Mac. At last, a speed test would run, which will state how much the performance of your Mac has improved after removal of the junk files.
  • Through this simple way, you can remove large junk files from your Mac.
High Sierra Install Usb

Cleanmymac x won’t be able to find duplicate folders on your Mac, due to which you would need to use another application.

Gemini is an application that would remove all the duplicate files and folders from your Mac.

  • Firstly, install the Gemini application.
  • When this application has been installed, open it.
  • Once the application has launched, press on the smart cleanup option.
  • Now Gemini will find and remove all the duplicate files and folders that cease to exist in your Mac.
  • Gemini also allows you to see how many duplicate files and folders exist on your Mac by pressing on the review results option.

Once you have cleaned your Mac, begin the backup process.

  • Plug in the external hard drive into your Mac.
  • Now go to system preferences and in here open the Time machine application.
  • In the left side of time machine, there will be a switch, which will be turned off. Click on this switch and turn it on.
  • In the time machine application, an option labeled “select backup disk” can be seen. Click on it and choose the external hard drive as the backup disk.
  • A message will open, which will state that whether you want to choose this drive as your backup disk. Select the yes option.
  • You need to make sure that the external hard drive is completely empty because the time machine application would reformat it.
  • Once the drive has been reformatted, time machine will start to back up your data.
  • Once the backup has been completed, open up the Mac app store.
  • Here Search for High Sierra in the search bar and download this application.
  • Once the application has been installed, it can be seen by the name of MacOS high sierra in the applications folder. It should be noted that this application opens up automatically once it is installed, so make sure to close it.
  • Now click on the link given: Download
  • This link will install the High sierra installer in your Mac.
  • Once the installer has been downloaded, plug in the USB in your Mac.
  • In this USB, place the high sierra installer file.
  • You should empty up the USB drive because MacOS will reformat it.
  • Once the USB drive has been reformatted, change the name of the USB to “High sierra”.

Install the High Sierra installer with Terminal

  • Once the high sierra installer file has been placed in the USB, open up the terminal application in order to create a boot disk.
  • If you have unplugged the USB in which the High Sierra installer is placed, plug it back into your Mac.
  • Once the terminal application has been opened, enter the following commands in its console: sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/HighSierra
  • Once you have entered this command, you will be asked to enter your username and password.
  • After you have entered these details, a warning message will appear stating that all the contents of this drive will be deleted. Enter Y to confirm this statement.
  • Now the terminal would delete the contents of your USB.
  • You will now be asked that if you want to the bootable High Sierra USB drive for your backups. Choose the “Don’t use “option and terminal will copy the installer to the drive in which High sierra is saved.
  • When the installation process has been completed, close the terminal application.

Installation of MacOS.

  • Once the bootable High sierra installer has been created, you will be required to install MacOS.
  • Before starting the process of Installing MacOS, you should create a Backup of all the files stored on your Mac, as in this installation process, all the contents on your Main drive will be deleted.
  • To begin the installation process, you would need to open up system preferences.
  • In here, look for startup disk and once it is found, open it.
  • In startup disk, you will be required to choose an installer. Choose the High sierra installer file.
  • Now you would need to restart your Mac.
  • As soon as your Mac turns back on, press the command and R key. This will load your Mac in recovery mode.
  • Now plug in the USB in which the High sierra installer file has been stored.
  • After some seconds, a MacOS utility screen will open. In here you need to press on ‘ Reinstall a new copy of MacOS’s and hit the continue button.
  • Now a terms and conditions page will be opened before you. Read these and then press Agree.
  • Now you will need to choose your Mac’s main drive. Click on it and press install.
  • Now the installation process of the MacOS High Sierra will begin and after some time a New MacOS will be installed in your Mac.

An alternative method for installation MacOS high sierra

This method will be much safer than the above method, but you will be required to divide your Mac’s main drive into several partitions or you would need to have an external hard drive.

Another benefit of installing High Sierra MacOS through this method is that none of your data will be erased from your Main drive because the high sierra MacOS will be installed in the external hard drive.

You need to follow a simple procedure in order to attain MacOS high sierra via this method:

  1. Open up disk utility on your Mac.
  2. Here, select the external drive as the disk on which you want to install the MacOS High sierra.
  3. Once you have chosen this file, a window will pop up.
  4. In this window, press on the erase option.
  5. Now go to the Mac app store and install high sierra from here.
  6. Once this application has been installed, download its installer from this link: Download
  7. When the installer has been downloaded, open it.
  8. In the installer, look for a tab labelled “show all disks”. When you find this tab, click on it.
  9. Now choose the external drive as the destination for storing this installer.
  10. The last step is to follow all the instructions in the installation guide of the installer so that you can install MacOS High sierra on your Mac.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. 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. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* 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.

High Sierra Install Usb


After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Create High Sierra Install Usb

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Create High Sierra Install Usb

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

Create High Sierra Install Usb On Windows

For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal: