How to Create a Bootable Windows Installation Drive on USB

What you're creating and why it matters

A bootable Windows USB drive is a flash drive that contains the Windows installer and can start your computer before Windows loads. Instead of relying on a built-in recovery partition or installation disc, you carry the entire Windows setup on a device the size of your thumb. This matters because it lets you install Windows on a new machine, repair a broken installation, or switch between computers without needing a disc drive — which most laptops no longer have.

The process involves downloading the Windows installer from Microsoft, using a tool to write it to the USB drive in a special way, and then booting from that drive. The "special way" is important: you cannot straightforward copy files onto a USB drive the way you would copy photos. The drive must be formatted and structured so your computer recognizes it as a bootable device before Windows even starts.

Key Takeaways

You need a USB drive with at least 8 GB of storage space, a computer with internet access, and the Windows installation media creation tool from Microsoft.
The Media Creation Tool erases everything on the USB drive and restructures it, so back up any files on that drive first.
The process takes 15 to 30 minutes depending on your internet speed and USB drive write speed.
After creation, you restart your computer, enter the boot menu (usually by pressing F12, F2, or Delete during startup), and select the USB drive to begin the Windows installer.
You will need a valid Windows product key or license to complete the installation on the target computer.

Gather what you need before starting

You need three things: a USB flash drive with at least 8 GB of space (16 GB is safer), a computer with internet access, and about 30 minutes. The USB drive will be completely erased, so if it contains files you want to keep, copy them to another location first.

Check that your USB drive actually has the space it claims. Cheap drives sometimes advertise more capacity than they truly have. Plug it into your computer, right-click it in File Explorer (Windows) or Finder (Mac), select Properties or Get Info, and look at the "Used space" and "Free space" figures. If the total is less than 8 GB, use a different drive.

You will also need to know which version of Windows you want to install — Windows 11 Home, Windows 11 Pro, Windows 10, or an older version. If you are replacing an existing Windows installation, check your current system by opening Settings, scrolling to "About", and looking at the Edition field. This tells you which version you own a license for.

read the Windows Media Creation Tool

Go to the Microsoft Windows read page in your web browser. The URL is microsoft.com/software-read/windows (for Windows 11) or microsoft.com/software-read/windows10 (for Windows 10). Do not use a search engine to find this — search results often link to fake read pages that look identical but contain malware.

On the official page, you will see a button labeled "read now" under "Create Windows installation media". Click it. This downloads a small program called the Media Creation Tool, usually to your Downloads folder. The file is about 20 MB and takes less than a minute to read on a normal internet connection.

Once downloaded, double-click the file to run it. Windows may ask "Do you want to allow this app to make changes to your device?" — click Yes. The tool opens and shows you a license agreement. Read it if you wish, then click "Accept" to continue.

Run the Media Creation Tool and select your USB drive

The tool asks "What do you want to do?" with two options: "Upgrade this PC now" or "Create installation media for another PC". Choose the second option, "Create installation media for another PC", even if you are installing on the same computer. This gives you more control and creates a reusable drive.

On the next screen, select your language, Windows edition (Home, Pro, etc.), and architecture (64-bit or 32-bit). For almost all modern computers, choose 64-bit. If you are installing on a very old machine from before 2010, check whether it supports 64-bit by opening Settings > System > About and looking at the "System type" field. If it says "32-bit operating system", select 32-bit here.

The tool asks "Which media do you want to use?" with two options: USB flash drive or ISO file. Select USB flash drive. Plug in your USB drive if you have not already. Click Next, and the tool shows you a list of connected drives. Select your USB drive from the list — it will show the drive letter (like "E:" or "F:") and the capacity. Double-check that you have selected the correct drive, because the next step erases it completely.

Let the tool write Windows to your USB drive

After you select the USB drive, the Media Creation Tool shows a summary of what it is about to do. It will read the Windows installer files (this takes 5 to 15 minutes depending on your internet speed) and then write them to the USB drive (another 5 to 10 minutes). The total time is usually 15 to 30 minutes. Do not unplug the USB drive or restart your computer during this process.

The tool shows a progress bar as it works. When it reaches 100%, it displays a message saying "Your USB flash drive is ready". At this point, the drive contains a complete Windows installer and is bootable. You can now unplug it safely.

If the tool shows an error message, the most common causes are a USB drive that is too small, a drive that is write-protected (some drives have a physical lock switch on the side), or a drive that is failing. Try a different USB drive and run the tool again.

Boot from the USB drive on your target computer

Plug the USB drive into the computer where you want to install Windows. Restart that computer. As it starts up, before Windows loads, press a key to enter the boot menu. The key varies by manufacturer: common ones are F12, F2, Delete, Escape, or F10. You usually have only a few seconds to press it, so start pressing the key repeatedly as soon as you see the manufacturer's logo.

The boot menu shows a list of devices your computer can start from — usually the hard drive, USB drives, and sometimes a CD drive. Select your USB drive from the list. It may be labeled with the drive's brand name, or straightforward as "USB Device" or "Removable Media". Press Enter to boot from it.

The Windows installer loads from the USB drive. You see the Windows logo and then a screen asking you to choose your language, time zone, and keyboard layout. From this point forward, you are following the normal Windows installation process, not the USB creation process. The installer will ask you where to install Windows (which hard drive or partition), and then copy files and configure the system.

Troubleshooting if your computer will not boot from USB

If you enter the boot menu but do not see the USB drive listed, the drive may not have been created correctly. Restart the computer, go back to the Media Creation Tool on your original computer, and run it again with the same USB drive. Make sure you selected "USB flash drive" and not "ISO file" in the tool.

If the USB drive appears in the boot menu but selecting it does nothing, or the computer restarts and boots Windows normally instead, the drive may be corrupted. Try the Media Creation Tool a second time. If that fails, try a different USB drive — some drives have compatibility issues with certain computers.

If you cannot find the boot menu key for your computer, search online for "[your computer brand] boot menu key" — for example, "Dell boot menu key" or "HP boot menu key". The key is usually printed on the startup screen for a moment, but searching is faster than watching for it.

Frequently Asked Questions

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

Yes. Once you create the bootable drive, you can use it on any computer. You can unplug it after installation is complete and use it on another machine. The drive itself is not tied to any one computer.

What if I need Windows 10 instead of Windows 11?

Go to microsoft.com/software-read/windows10 instead of the Windows 11 page. The Media Creation Tool for Windows 10 works the same way. You can create separate USB drives for different Windows versions if you need both.

Do I lose the files on my USB drive if I create a bootable Windows drive?

Yes. The Media Creation Tool erases the entire USB drive and restructures it for booting. Copy any files you want to keep to another location before you start the process.

Can I create a bootable Windows USB drive on a Mac?

The Media Creation Tool is Windows-only. On a Mac, read the Windows ISO file from the Microsoft page instead of using the tool, then use a third-party tool like Etcher or Transmac to write it to the USB drive. The steps are similar but the software is different.

What if the Windows installer asks for a product key and I do not have one?

You can skip this step during installation and enter the key later. Windows will install and run in an unlicensed state for a period of time, showing a watermark on the desktop. You can purchase a key from Microsoft or a retailer and set up Windows afterward through Settings > System > set up.

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.