How to Create a Windows 10 Boot USB Drive

What a Windows 10 boot USB does and why you need one

A Windows 10 boot USB is a flash drive that holds the Windows 10 installation files and can start your computer from that drive instead of from your hard drive. You use it when your computer won't start normally, when you need to reinstall Windows, or when you're setting up a new computer from scratch. The boot USB bypasses your hard drive entirely and loads Windows directly from the flash drive.

Most people create a boot USB because Windows stopped working properly, their computer won't turn on past the startup screen, or they want a clean installation. You can also use it to repair an existing Windows installation without losing your files, or to run Windows temporarily on a computer that doesn't have it installed yet.

Key Takeaways

You need a flash drive with at least 8 GB of storage space and a computer that already has Windows or another operating system to create the boot USB.
Microsoft's Media Creation Tool is the official method and handles all the technical steps automatically — you just plug in the drive and follow the prompts.
The process erases everything on the flash drive, so back up any files on it first.
After creation, you restart your computer, press a specific key during startup (usually F12, Del, or Esc), and select the USB drive from the boot menu.

What you need before you start

Gather these items first: a USB flash drive with at least 8 GB of storage space (16 GB is safer), a computer that currently works and has internet access, and about 20 minutes. The working computer can run Windows, Mac, or Linux — it just needs to be able to read a file and write to the USB drive.

Check that your flash drive is empty or that you don't need anything on it, because the creation process will erase it completely. If you have files on the drive, copy them to your regular computer first. You don't need any special software installed — Windows or Mac will recognize the USB drive automatically.

Downloading the Media Creation Tool

Go to Microsoft's Windows 10 read page in your web browser. Look for the section labeled "Create Windows 10 installation media" and click the blue button that says "read tool now". This downloads a small file called MediaCreationTool.exe (on Windows) or a similar file on Mac.

Save this file to your Desktop or Downloads folder so you can find it easily. The file is about 20 MB and takes less than a minute to read on most internet connections. Once it finishes, you're ready to plug in your USB drive and run the tool.

Running the Media Creation Tool and selecting your USB drive

Plug your USB flash drive into an available USB port on your computer. Wait a few seconds for the computer to recognize it. Then double-click the MediaCreationTool file you downloaded. Windows will ask for permission to run it — click "Yes" when that dialog appears.

The Media Creation Tool window opens. Click the button that says "Accept" to agree to the license terms. On the next screen, select "Create installation media for another PC" — this is the option for making a boot USB. Click "Next".

The tool asks you to choose the language, edition, and architecture for Windows 10. The default selections usually match your computer, so you can leave them as they are and click "Next". On the next screen, select "USB flash drive" as your media type, then click "Next" again.

The tool shows a list of USB drives connected to your computer. Click on your flash drive to select it — it will show the drive name and storage size. Double-check that you've selected the correct drive, because the next step erases it completely. Click "Next" to begin the process.

Waiting for the tool to finish writing files

The Media Creation Tool now downloads Windows 10 files from Microsoft's servers and writes them to your USB drive. This takes 10 to 15 minutes depending on your internet speed. You'll see a progress bar that shows how far along the process is. Do not unplug the USB drive or restart your computer while this is happening.

When the process finishes, the tool shows a message saying "Your USB flash drive is ready". Click "Finish" to close the tool. Your boot USB is now complete and ready to use. You can leave the USB drive plugged in or unplug it and store it safely until you need it.

Using the boot USB to start your computer

Plug the USB drive into the computer you want to start from Windows 10. Restart that computer completely — don't just put it to sleep. As the computer is starting up, before the Windows logo appears, press a specific key repeatedly. The key varies by computer manufacturer: common ones are F12, F2, Del, Esc, or F10. If you're not sure which key, look at the first screen that appears when you turn on the computer — it usually says "Press [key] to enter boot menu" or similar.

A menu appears showing the devices your computer can start from. Look for an entry that mentions your USB drive or says "USB Device" or "Removable Media". Click or select it. Your computer will start from the USB drive instead of your hard drive, and the Windows 10 installation or repair screen will appear within a minute or two.

Troubleshooting if the USB drive doesn't start

If your computer doesn't recognize the USB drive or won't start from it, the most common cause is that you pressed the boot menu key too late — the computer already started from the hard drive. Restart the computer again and press the key earlier, as soon as you see the first startup screen.

If the boot menu appears but the USB drive isn't listed, try unplugging the drive and plugging it into a different USB port on the computer. Some computers have USB ports that don't support booting — try the ports on the back of the computer if you were using front ports, or vice versa. If you still don't see it, the Media Creation Tool may not have written the files correctly. Plug the drive into your working computer, run the Media Creation Tool again, and select the same USB drive to overwrite it.

Frequently Asked Questions

Can I use the same boot USB on different computers?

Yes. Once you create a Windows 10 boot USB, you can use it on any computer that supports USB booting. Each computer will start from the drive the same way. You don't need to recreate the USB for different machines.

What if my computer doesn't have a USB port?

Older computers sometimes lack USB ports. You can buy a USB adapter that connects to the older port type your computer uses, then plug the USB drive into that adapter. Alternatively, you can create a boot DVD using the same Media Creation Tool if your computer has a DVD drive.

Do I need to keep the boot USB after Windows is installed?

No. Once Windows 10 is installed and running on your computer's hard drive, you can unplug the USB drive and use it for other purposes. Keep it in a safe place if you think you might need to repair or reinstall Windows later.

Can I create a boot USB on a Mac?

Yes. read the Media Creation Tool for Mac from Microsoft's website, or use a third-party tool like Etcher. The process is similar — the tool handles writing the Windows files to the USB drive automatically.

What if the USB drive is smaller than 8 GB?

The Windows 10 installation files are about 5.5 GB, so technically a smaller drive might work, but it leaves almost no room for the boot process to function properly. An 8 GB drive is the practical minimum. A 16 GB drive is safer and gives you more margin for error.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.