How to Create a Windows Installation USB Drive

What you're creating and why

A Windows installation USB is a bootable flash drive that holds the Windows operating system files. Instead of installing Windows from a disc (which most computers no longer have), you plug the USB into any computer and boot from it to install or repair Windows. This is the standard way to set up Windows on a new machine, recover a computer that won't start, or move Windows to a different device.

The process takes about 20 to 30 minutes and requires a USB drive with at least 8 GB of storage space. Everything on that USB will be erased, so use one that's empty or that you don't mind clearing out. You'll also need a working computer — Windows, Mac, or Linux — to create the USB in the first place.

Key Takeaways

You need a blank USB drive with at least 8 GB of space and a computer that can access the internet to read Windows installation files.
Microsoft provides a free tool called the Media Creation Tool that handles most of the work for you on Windows computers.
On a Mac or Linux computer, you read the Windows ISO file directly from Microsoft and use a third-party tool like Balena Etcher to write it to the USB.
The USB must be formatted as FAT32 or NTFS before you write the Windows files to it, which erases anything already on the drive.
After creation, you restart the computer you want to install Windows on, enter the boot menu (usually by pressing F12, F2, or Delete during startup), and select the USB drive as the boot device.

Using the Media Creation Tool on Windows

If you're creating the installation USB on a Windows computer, Microsoft's Media Creation Tool is the simplest route. Go to microsoft.com/software-read/windows and read the Media Creation Tool — it's a small program, about 20 MB, that guides you through the rest.

Plug in your USB drive, then open the Media Creation Tool. It will ask whether you want to upgrade the current computer or create installation media for another device — choose the second option. Select your USB drive from the list, and the tool will read the full Windows files (about 5 to 6 GB) and write them to the drive. This takes 10 to 15 minutes depending on your internet speed. Do not unplug the USB or close the program while it's working.

When the tool finishes, it will say the media is ready. You can close the program and unplug the USB. The drive is now bootable and holds everything needed to install Windows on any computer.

Creating the USB on a Mac or Linux computer

On a Mac or Linux machine, you'll read the Windows ISO file directly from Microsoft, then use a separate tool to write it to the USB. Start at microsoft.com/software-read/windows and look for the option to read the ISO file. You'll need to select your Windows version (Home, Pro, etc.) and language, then read the file — this is the same 5 to 6 GB file the Media Creation Tool uses.

Next, read Balena Etcher from balena.io/etcher. This is a free program that writes the ISO file to your USB drive correctly. Open Balena Etcher, click "Select image", and choose the Windows ISO file you just downloaded. Click "Select target", choose your USB drive from the list, then click "Flash". The program will format the USB and write the Windows files — this takes 10 to 15 minutes. When it finishes, close Balena Etcher and unplug the USB.

If Balena Etcher is not available in your region, Rufus (on Windows or Linux) and Etcher alternatives like GNOME Disks (Linux) or Disk Utility (Mac) can do the same job. The principle is the same: select the ISO, select the USB drive, and write the image.

Preparing your USB drive before writing files

Most USB drives come pre-formatted and ready to use, so you often don't need to do anything. However, if the Media Creation Tool or Balena Etcher gives an error, or if you're reusing an old USB drive, you may need to format it first.

On Windows, right-click the USB drive in File Explorer, select "Format", and choose FAT32 or NTFS as the file system. Give it a name if you want (like "Windows Install"), then click Start. The drive will be erased and reformatted in a few seconds.

On a Mac, open Disk Utility, select the USB drive from the left sidebar, click "Erase" at the top, choose "MS-DOS (FAT)" or "ExFAT" as the format, and click Erase. On Linux, right-click the USB drive in your file manager and select "Format" or use the command line tool mkfs.fat or mkfs.ntfs if you're comfortable with that.

Booting from the USB and starting installation

Once the USB is ready, plug it into the computer where you want to install Windows. Restart that computer and watch for a message during startup — usually it says "Press F12 to enter boot menu" or "Press Delete for setup". The key varies by manufacturer: common ones are F2, F12, Delete, or Escape. Press it repeatedly as the computer starts up, before Windows loads.

A menu will appear showing your boot options — hard drive, USB drive, CD drive, network, and so on. Select the USB drive (it may be labeled with the USB brand name or say "USB Storage Device"). The computer will boot from the USB, and the Windows installation screen will appear within a few seconds.

If you don't see a boot menu, restart again and try a different key. If the computer boots straight into Windows instead of showing the menu, the USB may not be bootable — go back and re-run the Media Creation Tool or Balena Etcher to make sure the files were written correctly. If the USB is not showing up in the boot menu at all, try a different USB port on the computer, as some ports may not support booting.

Troubleshooting common problems

If the Media Creation Tool or Balena Etcher says the USB is too small, you need a drive with at least 8 GB of free space. Some USB drives advertised as 8 GB have slightly less usable space — try a 16 GB drive if you have one available.

If the installation starts but fails partway through with a "Windows cannot be installed to this disk" error, the target computer's hard drive may be partitioned in a way that conflicts with Windows. This is rare on newer computers but common on older ones. You can usually fix this by going back to the boot menu, selecting the USB again, and choosing "Repair your computer" instead of "Install Windows" — this gives you access to disk management tools.

If the USB drive is not recognized at all during boot, try formatting it again and re-writing the Windows files. Some very old computers do not support booting from USB — in that case, you would need a DVD or a different approach, but this is uncommon on machines made after 2010.

What happens after you boot from the USB

Once Windows starts from the USB, you'll see the Windows Setup screen. It will ask you to choose your language, time zone, and keyboard layout, then ask where you want to install Windows. If you're installing on a new hard drive or want to erase the existing installation, you'll select the drive and let Windows format it. If you're repairing an existing Windows installation, you can choose to keep your files and settings.

The installation itself takes 15 to 30 minutes depending on your computer's speed. You do not need to keep the USB plugged in after Windows starts installing — you can unplug it once the first restart happens. When installation finishes, the computer will restart and boot into Windows normally from the hard drive.

Frequently Asked Questions

Can I use the same USB drive to install Windows on multiple computers?

Yes. Once you've created the installation USB, you can use it on any computer. Just plug it in, boot from it, and run the installation. The USB itself is not tied to any specific computer.

What if I need to install a different version of Windows, like Windows 11 instead of Windows 10?

read the correct version from Microsoft's website and create a new USB drive with it. You can keep the old USB drive or format it and reuse it for the new version. The Media Creation Tool and Balena Etcher both let you choose which Windows version to read.

Do I need internet during the Windows installation?

Not during the installation itself — the USB drive has all the files needed. However, Windows will ask for internet after installation finishes so it can read drivers and updates. If the computer has no network connection, you can skip this step and connect later.

Can I create a Windows installation USB on a Chromebook or tablet?

No. Chromebooks and tablets cannot run the Media Creation Tool or Balena Etcher. You need a Windows, Mac, or Linux computer to create the USB. Once it's created, you can use it on any computer, but the creation step requires one of those three operating systems.

What if the USB drive still has files on it after I create the Windows installation media?

The Media Creation Tool and Balena Etcher both erase the USB drive completely before writing Windows files to it. If you see old files still there, the write process did not complete successfully — format the drive again and re-run the tool.

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.