How to make bootable high sierra usb

A bootable install volume of macOS

Please note that your Mac can't boot from a USB containing a macOS version older than the one the computer shipped with. So ensure the bootable installer you want to create is compatible with your Mac model before getting started. Its data will be erased when making the bootable installer, so ensure the essential files are all backed up. To download macOS To download OS X

How to make bootable high sierra usb

Please note that before installing any system, you need to ensure there is sufficient space on your Mac. MacKeeper allows you to free up necessary gigabytes easily. The app will help you delete junk, duplicates, and unnecessary apps in a couple of clicks. Try MacKeeper now! 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. Creating a bootable drive with a High Sierra installer is quite simple. Basically, all you need is:. Well, your Mac might get slow due to system junk and other unneeded files. Therefore, you have to delete all this junk before backing up your data. One of the easiest ways to clean your Mac is to use an app such as MacKeeper that will easily and quickly delete all useless and duplicated files while keeping the useful stuff intact. The drive needs to be blank. Therefore, Time Machine will ask for your permission to reformat your external hard drive. For a more detailed guide, check out our article on how to back up your Mac using Time Machine. Get an external drive you want to save the installer on.

Note the way the USB needs to be formatted.

You can also use your bootable installer to install macOS on a separate volume of your hard drive or on a partition if you are running an older version of the Mac OS. Once is quite enough! Luckily, making a bootable installation of the Mac operating system became a whole lot easier when Apple launched OS X Mavericks back in If you want to run macOS on an external drive , which is slightly different, we have a separate article. We recommend a Flash memory stick, rather than a standard hard drive, as it will be quicker. If you have an M1 Mac you might actually be better off with a Thunderbolt drive because there have been some issues with using USB drives with the M1 Mac. Note: If you have data on the drive that you plan to use you will need to transfer it to another drive, or get a new drive, as it will be completely formatted and erased.

You can use an external drive or secondary volume as a startup disk from which to install the Mac operating system. These advanced steps are primarily for system administrators and other experienced users who are familiar with entering commands in Terminal. You don't need a bootable installer to upgrade macOS or reinstall macOS , but it can be useful if you want to install macOS on multiple computers without downloading the installer each time, or you're unable to install a compatible macOS from the Finder or macOS Recovery. Your Mac must also be compatible with the macOS that you're downloading. Enterprise administrators: download from Apple, not a locally hosted update server. Download a macOS installer using the App Store or your browser. Open Terminal, which is in the Utilities folder of your Applications folder. Type or paste one of the commands below into Terminal, then press Return to enter the command. Each command assumes that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using.

How to make bootable high sierra usb

A bootable install volume of macOS Making a USB install drive requires the usage of precise syntax at the command line with superuser privileges, using the wrong syntax could lead to unintended data loss. If the file size of the High Sierra installer is not over 5GB then you have the incomplete installer and will need to download the complete macOS High Sierra installer application as described here in order to create a bootable installer drive. Select the High Sierra installer at this screen. If you had previously created a boot installer for the High Sierra beta you may notice the syntax is different for createinstallmedia is different with the final version, part of that is to accommodate the new file name of the application installer, and the remainder removes the necessity of the —applicationpath flag and directive. Do you know of another approach to making a macOS High Sierra bootable install drive?

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Direct from Apple and worked perfectly. Just to clarify, then—I need two flash drives: one with the installer and the second on which I'll install the OS. December 11, at am. Depending on which version of macOS you are running, and the version you want to to install, you will either be able to get the installation files from Software Update in System Preferences, the Mac App Store, or you will have to obtain them from elsewhere. You successfully managed to install a new macOS High Sierra in a clean way. Milo Madacky says:. Go to the File menu and click "Open Disk Image. October 3, at am. Then you will need to insert a flash drive large enough to install High Sierra on, plus the newly created installer. Sign up and get: Effective tips on how to fix Mac issues. Carlos says:. Jan 11, PM in response to Ken Parsons. Some features require a compatible Internet service provider; fees may apply.

Please note that before installing any system, you need to ensure there is sufficient space on your Mac.

Any suggestions on how to do this? Choose the InstallOS. I followed a link on the App Store, but it only gave an update, not the full install package. Latest Updated on Wednesday, January 10, From there, you can now deploy High Sierra as you see fit. Here is the message in its entirety: To use this tool, you must download the macOS installer application on a Mac with November 9, at pm. Select the High Sierra installer at this screen. The drive gets formatted upon running the command to create the High Sierra installer. Extract the BaseSystem. 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. Start your computer with the bootable installer. Follow the onscreen instructions to install macOS. That's why this step is necessary.