Want to install macOS from a USB drive? We"ll walk you through this alternative method for installing macOS.

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As you may know, you can reinstall macOS on your computer via the mạng internet recovery method. But did you know that you can also create a bootable USB drive to lớn install macOS from? This will let you boot your Mac from a different source if it won't work normally, and makes installs on multiple machines easy.

Why Would You Need lớn Install macOS From a USB?

Creating a bootable USB drive and using it khổng lồ reinstall khổng lồ macOS is a bit of a lengthier process as opposed to simply updating macOS from the Software Update section of the System Preferences, but it has its benefits.


Creating a bootable USB disk allows you to lớn install or update macOS on multiple systems without having to tải về the installer on each Mac. This can save quite a bit of time, considering the most versions of macOS have an installer form size of 12GB.

You can also use the built-in recovery tools that come with the macOS installer lớn troubleshoot và fix different kinds of issues. These include regaining access lớn a Mac that refuses khổng lồ boot or recover files that seem to be lost. Another benefit of using a bootable disk for a macOS installation is that you can perform a clean install.


A clean install allows you lớn get rid of junk apps và files that may have accumulated over time. This almost always results in a Mac running faster after a clean install, since macOS has started over with a clean slate.

Related: Is Your Mac Running Slow? Simple Tips lớn Speed It Up


Choosing a USB Flash Drive for Installing macOS

USB flash drives are cheaper than ever, so you won't have khổng lồ spend much on this task. However, make sure to lớn buy a name-brand flash drive (like SanDisk, Kingston, or PNY) from a reputable store. Stay away from cheap drives with suspiciously high storage on sites lượt thích eBay.


Those drives often have their firmware hacked lớn report a false form size to your operating system. Not only will the transfer speeds be painfully slow, but using them may also result in loss of data or even a damaged USB port.


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Also, kiểm tra to see what ports you have on your Mac. Most of Apple's current laptop macbook models exclusively offer USB-C ports. Fortunately, there are a lot of USB-C drives available, or you can use a USB-C to USB-A adapter.

It's best to go with a USB 3.0 drive, with a minimum kích thước of 16GB. The Samsung BAR Plus is a good overall value for the money; we've also rounded up all the fastest USB 3.0 drives you can buy for more options.


Formatting Your USB Flash Drive

You can only create a bootable installer for macOS on a Mac. If you're using a flash drive that already has data on it, make sure lớn back up any important files now, as you're going khổng lồ erase everything in a moment.

Open Finder. Then navigate to Applications > Utilities, and open Disk Utility. You should see your flash drive under the External section in the left pane. After selecting it, click on the Erase button along the top.

Choose a friendly name (which you'll use later), và make sure lớn choose Mac OS Extended (Journaled) for the format. Finally, click Erase.


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Downloading the macOS Installer

Apple has changed the method for downloading versions of the operating system of macOS. While the installers were previously available to download via the ứng dụng Store, newer versions (macOS Mojave & later) update the system from System Preferences.

To tải về the latest version of the macOS installer for installing on a USB, xuất hiện up System Preferences và navigate to lớn Software Update. You should see the option to tải về the installer here.

You can also use the phầm mềm Store to xuất hiện System Preferences and download the update. Open the App Store and tìm kiếm for your version of macOS. Click on the View or Get button, which will mở cửa up System Preferences to download the installer. If you're on a version of macOS from before Mojave, you can still tải về the installer directly from the app Store.

Xem thêm: Các Phương Pháp Tẩy Trắng Răng Hiện Nay, 15 Bí Quyết Tẩy Trắng Răng Tại Nhà Hiệu Quả


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In the case that you are already running the latest version of macOS, you might not see the option to tải về the installer in System Preferences. In that case, use the tiện ích Store method detailed above. This will force System Preferences to download the installer, which you can then use to lớn create the bootable disk.


In either case, once the installer downloads and opens, quit it without continuing the installation.


Creating a Bootable USB Using Terminal

Terminal is the easiest way lớn create your bootable USB drive. Just replace the MyVolume portion of the commands below with the name you gave your drive in the Disk Utility step above.

Take chú ý that the commands differ slightly for creating bootable USBs for different versions of macOS. If you are going to lớn create a bootable drive for macOS Monterey, use the command below as it is. Otherwise, replace Monterey with the macOS version name (for example Mojave), etc.

To create a Monterey installer:

sudo /Applications/Install macOS Monterey.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

Copy & paste the command you need above into your Terminal window & press the Return key. After entering your password, confirm you want lớn erase the USB drive by typing Y followed by Return.


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Creating a Bootable Disk Using Software

If you prefer creating a bootable disk using the software method, you can use third-party applications to do so. Diskmaker X was the famous go-to utility for creating bootable disks, but it doesn't support the latest versions of macOS (High Sierra onwards). Instead, you can use the Install Disk Creator from MacDaddy for creating a bootable macOS installer.


Once you've downloaded the software, simply open it up. The app should automatically detect the macOS installer in your Downloads folder. Simply select the USB drive that you want to create a bootable disk on from the đứng đầu volume dropdown list, & click on Create Installer.

Related: How to Boot Your Mac in Safe Mode


Booting Your Mac From a USB Drive

Now if you find yourself in a sticky situation where your Mac isn't booting, or you want to bởi a fresh install of macOS, you have a solution. You can boot from your USB drive and not have to tải về the macOS installer again. This will come in handy for fixing the "macOS could not be installed" error.

There are two different methods to lớn boot your Mac from a bootable USB, depending on which processor your Mac has.

Intel Macs

Simply plug your created USB drive into an xuất hiện USB port on your Mac. Power nguồn on the system, or restart it if it's already on, & immediately press & hold the Option (Alt) key when it starts booting.

M1 apple Silicon Macs

To boot an M1 or táo khuyết silicon Mac using a bootable USB disk, power on the system or restart it if it's already on, và keep the Power button pressed down.


You should now see an option khổng lồ select your USB drive as a startup disk. After selecting it, your system will boot off your USB drive & enter macOS Recovery with the macOS Monterey installer appearing on your screen. If you want khổng lồ erase your disk first to bởi a clean install, quit the installer và run Disk Utility from the Recovery menu. You can then format the drive, and then go back to the Recovery menu và install macOS Monterey.


Some wireless keyboards may not work at this point. If you're having difficulty, plug in a wired keyboard instead. If you don't see your USB drive as one of the startup options, try a different USB port.


What to vì if Your Mac Won't Boot Using a USB

In some cases, hãng intel Macs with a T2 chip (Intel Macs released after 2018) may not allow you to lớn boot a macOS installer from an external drive. This is due lớn a setting in the Security Startup Utility that needs to lớn be adjusted. This can be done by following the steps explained below:

Boot into macOS Recovery by pressing Cmd + R while you turn on the Mac. A các mục of users will appear. Select & log in to the administrator's account. When the Mac has booted up, select the Utilities menu, & select Startup Security Utility. You may be asked to lớn authenticate again. Enter macOS password, choose an administrator account, and enter the password. Once the phầm mềm has launched, select the option to Allow booting from external media at the External Boot section at the bottom of the window. Quit the app và restart the Mac.

That's it! You should now be able to normally boot from the external drive using the steps detailed above.


Using Your Bootable macOS USB

You can perform a fresh install of macOS, restore from a Time Machine backup, or access tools like Disk Utility from the macOS Utilities screen. You can also use your USB drive to upgrade macOS lớn the latest version. If you need to lớn troubleshoot your Mac without a network connection, this USB drive could be a lifesaver.


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