How to Create a Bootable USB Drive for Windows 10

What a bootable USB drive is and why you need one

A bootable USB drive is a flash drive that contains the Windows 10 operating system and can start your computer from scratch. When you plug it in and restart your machine, the computer reads from the USB instead of from its hard drive, letting you install Windows 10 on a blank computer, repair a broken installation, or run Windows without installing it at all.

You need one when your computer won't start normally, when you're building a new machine from parts, or when you want to do a fresh Windows installation. The USB drive becomes your installation media — the physical thing that holds the software you're installing.

Key Takeaways

You need a USB drive with at least 8 GB of storage space and a second computer that already has Windows or another operating system to create the bootable drive.
Microsoft's Media Creation Tool is the official program that downloads Windows 10 and prepares your USB drive in one process.
The process takes 20 to 40 minutes depending on your internet speed, and it erases everything on the USB drive, so use one that's empty or that you don't mind losing data from.
After creation, you restart your target computer, press a specific key during startup (usually F12, Del, or Esc), and select the USB drive from the boot menu to begin installation.

What you need before you start

Gather these items first: a USB drive with at least 8 GB of storage space (16 GB is safer), a computer that already has Windows, Mac, or Linux on it, and an internet connection on that computer. The USB drive will be completely erased, so make sure it's empty or contains nothing you need to keep.

You also need to know the product key for Windows 10 if you have one, though you can enter it later during installation. If you're reinstalling Windows on a computer that already had it, Windows 10 may set up automatically using the hardware ID stored on that machine.

Downloading and installing the Media Creation Tool

Go to Microsoft's official Windows 10 read page and look for the "Media Creation Tool" link. This is the official program Microsoft provides for this exact task. read it to your helper computer — the one you're using to create the USB, not the one you're installing Windows on.

Once downloaded, open the Media Creation Tool. It will ask you to accept the license terms, then ask whether you want to upgrade this computer or create installation media for another computer. Select "Create installation media for another PC." The tool will then read the Windows 10 files (this step takes 10 to 20 minutes depending on your internet speed) and prepare your USB drive automatically.

Preparing your USB drive and running the tool

Plug your USB drive into the helper computer before you start the Media Creation Tool. When the tool asks you to select media, choose "USB flash drive" rather than "ISO file." The tool will detect your USB drive and list it by name and size.

Select your USB drive from the list. Double-check that you've selected the right drive — the tool will erase it completely. If you have multiple USB drives plugged in, unplug the ones you don't need so there's no confusion. Once you confirm, the tool downloads Windows 10 and writes it to the USB drive. This takes 15 to 30 minutes. Do not unplug the USB drive or close the tool during this time.

Booting from the USB drive on your target computer

When the Media Creation Tool finishes, safely eject the USB drive from your helper computer. Plug it into the computer where you want to install Windows 10, then restart that computer. As it's starting up, watch the screen for a message that says something like "Press F12 to enter boot menu" or "Press Del for setup." The key varies by manufacturer — common ones are F12, F2, Del, Esc, and F10.

Press that key repeatedly as the computer starts. You should see a menu listing different boot options. Look for an entry that mentions your USB drive by name or says "USB Device" or "Removable Media." Select it and press Enter. The computer will boot from the USB drive, and the Windows 10 installation screen will appear.

What happens after the USB boots

Once Windows 10 starts from the USB, you'll see the Windows Setup screen asking you to choose your language, time zone, and keyboard layout. After that, you'll be asked whether you want to repair an existing Windows installation or perform a clean install. If you're installing on a blank drive, select "Custom: Install Windows only."

The installer will ask you to select which drive or partition to install Windows on. If the drive is completely blank, you'll see unallocated space. Select it and click "Next." Windows will then copy files and install itself, which takes 10 to 20 minutes. Your computer will restart several times during this process — this is normal. Do not unplug the USB drive until Windows finishes and you see the desktop.

Troubleshooting if the USB doesn't boot

If your computer doesn't boot from the USB, the most common cause is that you pressed the boot menu key too late or too early. Try restarting and pressing the key as soon as you see the first logo or splash screen. Hold the key down rather than tapping it once.

If the boot menu appears but the USB drive isn't listed, the drive may not have been created successfully. Go back to your helper computer, run the Media Creation Tool again, and make sure you selected "USB flash drive" as the media type. If the tool says the USB drive is too small, you need a drive with at least 8 GB of free space. Some older computers also have a BIOS setting that disables USB booting — if you're working with a very old machine, you may need to enter the BIOS setup (usually by pressing F2 or Del during startup) and enable USB boot in the settings.

Frequently Asked Questions

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

Yes. Once you've created the bootable USB, you can use it on any computer. The USB drive itself isn't tied to any specific machine. You can plug it in, boot from it, and install Windows as many times as you need. The drive will work until the USB hardware fails.

What if I don't have a second computer to create the USB on?

You need a working computer to read Windows 10 and write it to the USB drive. If you don't have one, you could ask a friend or family member to create the USB for you, or visit a library or internet café that has computers available. Once the USB is created, you can use it on any computer.

Do I need the product key before I create the USB drive?

No. The Media Creation Tool doesn't ask for a product key. You can enter it during Windows installation or afterward. If you don't have a key, Windows will install and run in an unlicensed state, though you'll see a watermark on the desktop and won't be able to customize some settings.

Will creating the USB drive delete files on my helper computer?

No. The Media Creation Tool only erases the USB drive itself, not your helper computer. Your helper computer's files are completely safe. Only the USB drive is wiped.

Can I use a USB 2.0 drive instead of USB 3.0?

Yes, but it will be slower. USB 2.0 drives work fine for creating and installing Windows 10 — the process just takes longer. USB 3.0 is faster, but not required. Either will work as long as the drive has at least 8 GB of space.

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.