By Adam Smart, Ecokeys Support Engineer — Last updated 11 August 2026

What You Need to Create a Bootable Windows USB

Before starting, make sure you have:

• a working Windows PC;
• a reliable internet connection;
• a blank USB flash drive with at least 8 GB of space;
• sufficient free space on the PC for the Windows download; and
• administrator access on the PC running the Media Creation Tool.

Does the USB need to be USB 3.0?

No. USB 3.0 is not required simply to create Windows installation media.

A faster USB drive can reduce the time needed to create and read the media, but an otherwise suitable USB drive can still work when connected through an older USB interface.

Should You Create Windows 11 or Windows 10 Media in 2026?

For a compatible PC intended for ongoing use, Windows 11 should normally be the starting point.

Normal Microsoft support for Windows 10 ended on 14 October 2025. Microsoft still provides the Windows 10 Media Creation Tool, which can be useful for reinstalling an existing Windows 10 computer, recovering a legacy system or dealing with a specific compatibility requirement.

If you are not sure whether the computer can run Windows 11, check it before creating installation media.

Method 1: Create a Bootable USB with Microsoft's Media Creation Tool

For most users, Microsoft's Media Creation Tool is the easiest method because Microsoft handles the Windows download and USB preparation in one process.

You do not need to download an ISO first when using the tool to create the USB directly.

Step 1: Download the correct Media Creation Tool

Use Microsoft's official software-download page for the version of Windows you need:

If you need more detail about Microsoft's different download options, see our guide to downloading Windows 11 safely.

Step 2: Insert the USB flash drive

Connect the blank USB flash drive to the computer.

If several removable drives are connected, consider disconnecting any that are not needed. This reduces the chance of accidentally selecting the wrong drive later.

Step 3: Run the Media Creation Tool

1. Open the Media Creation Tool you downloaded from Microsoft.
2. Allow it to run with administrator privileges.
3. Read Microsoft's licence terms.
4. If you agree, select Accept.
5. Select Create installation media for another PC.
6. Select Next.

Step 4: Choose the Windows options

The exact choices vary slightly between Windows 10 and Windows 11.

For Windows 11

Select the required language, Windows edition and 64-bit architecture when presented with those options.

For Windows 10

The Windows 10 Media Creation Tool can provide architecture choices including 64-bit and 32-bit Windows 10. Use the architecture appropriate to the computer being repaired or reinstalled.

Step 5: Select USB flash drive

1. Choose USB flash drive.
2. Select Next.
3. Review the list of removable drives carefully.
4. Select the USB drive you intend to erase and use.
5. Continue.

Step 6: Let Microsoft create the installation media

The tool will download Windows and prepare the USB.

The time required varies depending on:

• internet connection speed;
• Microsoft's download speed;
• the performance of the computer;
• the USB drive; and
• the USB port being used.

Leave the PC powered on and keep the USB connected until the tool confirms that the installation media is ready.

Step 7: Safely eject the USB

Once the Media Creation Tool has finished:

1. Close the Media Creation Tool.
2. Open File Explorer.
3. Locate the USB drive.
4. Use Eject before removing it where appropriate.

The bootable Windows USB is now ready.

Do You Need an ISO File to Create a Bootable USB?

Not when using Microsoft's Media Creation Tool to create the USB directly.

An ISO is useful when:

• you already downloaded the Windows installation image;
• you want to keep a reusable copy of the installation image;
• you need the ISO for a virtual machine;
• you want to create media with a separate USB-writing tool; or
• your particular installation workflow requires an ISO.

For Windows 11, obtain the ISO from Microsoft rather than an unofficial Windows download site.

Method 2: Create a Bootable USB from an ISO with Rufus

Rufus is a separate open-source utility that can write bootable ISO images to USB drives.

You do not need Rufus for a normal Windows installation when Microsoft's Media Creation Tool works for your needs. It becomes useful when you already have the official ISO or need more control over how the USB is prepared.

Before using Rufus

You need:

• a blank USB flash drive;
• an official Windows ISO;
• the current Rufus application; and
• an understanding of whether the target PC boots using UEFI or legacy BIOS where that choice is relevant.

Step 1: Download Rufus

Use the official Rufus website:

Official Rufus website

Step 2: Insert the USB drive

Connect the USB drive and open Rufus.

Check the Device field carefully to make sure Rufus has selected the USB you intend to erase.

Step 3: Select the Windows ISO

1. Under Boot selection, choose the disk or ISO image option.
2. Select SELECT.
3. Browse to the official Windows ISO.
4. Open the ISO.

Step 4: Check the target system

Rufus normally selects suitable settings after reading the ISO, but the target firmware still matters.

For a normal supported Windows 11 installation, the target PC uses UEFI and Windows 11 requires UEFI firmware with Secure Boot capability.

Older Windows 10 computers can include legacy BIOS configurations, which is one reason Rufus exposes additional partition-scheme and target-system options.

Step 5: Start creating the USB

1. Review the selected USB drive.
2. Review the ISO.
3. Select START.
4. Read any prompts or Windows installation options Rufus presents.
5. Confirm the data-erasure warning only when you are certain the correct USB is selected.
6. Wait for Rufus to finish writing and verifying the media.

Step 6: Wait for Rufus to show Ready

Do not disconnect the USB while Rufus is writing to it.

When the process is complete and Rufus reports that the drive is ready, close Rufus and safely remove the USB.

Media Creation Tool or Rufus: Which Should You Use?

For an ordinary Windows 11 installation on a compatible PC, Microsoft's Media Creation Tool is usually the better starting point.

How to Check Whether the Bootable USB Works

You do not have to begin installing Windows simply to confirm that the USB can boot.

The most reliable test is to start the intended computer from the USB and confirm that Windows Setup appears.

Use the computer's boot menu

Many PCs have a temporary boot menu that can be opened during startup. The key differs between manufacturers and may include keys such as F12, F9, Esc or another manufacturer-specific key.

Check the computer manufacturer's support information rather than repeatedly changing permanent boot-order settings unnecessarily.

1. Connect the Windows USB.
2. Restart or switch on the computer.
3. Open the manufacturer's temporary boot menu.
4. Select the USB device.
5. Confirm that Windows Setup loads.

Bootable Windows USB Troubleshooting

The USB drive does not appear in Media Creation Tool

Try the following:

• disconnect and reconnect the USB;
• try a different USB port;
• restart the Media Creation Tool;
• check whether Windows can see the drive in File Explorer or Disk Management; and
• try another suitable USB drive if necessary.

Media Creation Tool fails during the download

Check the internet connection and available storage on the PC, then run the tool again.

If the problem continues, restart Windows and make sure current Windows updates are installed before retrying.

The USB was created but the PC does not boot from it

This can be caused by:

• the PC booting from its internal drive instead of USB;
• incorrect UEFI or legacy BIOS settings;
• a damaged USB flash drive;
• incorrectly created third-party media; or
• firmware settings preventing the selected USB from booting.

Start by using the PC manufacturer's temporary boot menu and selecting the USB manually.

Windows Setup appears, but the PC says it cannot run Windows 11

The USB working correctly does not mean the target PC meets the Windows 11 requirements.

Check TPM 2.0, Secure Boot, processor support and the other requirements using our Windows 11 compatibility guide.

The ISO may be damaged

If you created the USB from an ISO and experience unexplained problems, download the ISO again from Microsoft and recreate the media.

For Windows 11, Microsoft also provides SHA-256 information that can be used to verify an official ISO before writing it to USB. Our safe Windows 11 download guide explains this process.

The USB seems smaller after creating installation media

Bootable-media tools can repartition a USB drive. This may make its normal usable capacity appear different when you later try to use it for ordinary file storage.

The USB can normally be reformatted and repartitioned after you have finished using it as Windows installation media. Make sure you no longer need the installer before erasing it.

Can the Same Windows USB Be Used More Than Once?

Yes. The installation media itself is not normally restricted to a single use.

You can keep a Windows installation USB for reinstallations or use suitable media on another compatible computer.

Installation media and Windows licensing are separate things. The USB provides the Windows setup files; each computer still needs the appropriate activation entitlement or licence for the Windows edition being installed.

Can a Bootable Windows USB Be Used for Repairs?

Yes. Windows installation media can also provide access to recovery and troubleshooting options when a Windows computer does not start normally.

That can make a bootable USB useful even when you do not intend to perform a clean installation.

However, be careful to distinguish recovery options from a clean installation. A clean installation can remove personal files, applications, settings and manufacturer customisations.

Your USB Is Ready: What Next?

If your aim is to install Windows 11, stop here once the bootable USB has been created successfully.

The actual installation process includes separate decisions about:

• booting the target PC from USB;
• Windows edition selection;
• product keys and digital licences;
• upgrade versus clean installation;
• disk and partition selection;
• Windows setup; and
• activation after installation.

How to Create a Bootable Windows USB: Final Advice

For most users, creating Windows installation media does not need to be complicated.

Use Microsoft's Media Creation Tool when you want the standard official route. Choose the correct USB drive, remember that its contents will be erased, and allow the tool to complete before disconnecting it.

If you already have an official Windows ISO, Rufus is a useful alternative, but its extra options mean you should understand the target PC's firmware and installation requirements rather than changing settings at random.

Once the USB is ready, keep the media-creation stage separate from the Windows installation itself. This reduces the risk of accidentally deleting files or selecting installation options before you are ready.

Frequently Asked Questions