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Windows 11 boot media: Media Creation Tool, Rufus, Ventoy — or the Installation Assistant

Verified 3 min read

Choose between the Installation Assistant, Media Creation Tool, Rufus and Ventoy for a Windows 11 26H2 upgrade or clean install, understand GPT/UEFI and Secure Boot implications, and avoid modified images.

Tested onPro (26H2) · Build 26300.9457 · x64
E2
Build
26300.9457
Edition
Pro (26H2)
Architecture
x64
Support
Lab (USB media)
Evidence
E2Reproduced in the lab
Verified
2026-10-28
Test machine
Lab USB media written from the official 26H2 ISO; UEFI boot tested
Page type
Task

The short answer

Section titled “The short answer”
  • Media Creation Tool is the lowest-friction official path. It downloads Windows and writes a USB or ISO.
  • Rufus is a small third-party writer with more control over GPT/UEFI and filesystem choices. Use it with the official ISO, not a modified one.
  • Ventoy is for carrying multiple ISOs on one USB. It is convenient, but it adds a boot layer and is the wrong tool if you need the simplest possible install.

All three can produce a bootable Windows 11 USB. None of them makes an unsupported PC supported.

Comparison

Section titled “Comparison”
Media Creation Tool Rufus Ventoy
Source Microsoft Third-party Third-party
Needs an ISO? Can download or use one Yes Yes, multiple
UEFI/GPT Automatic Selectable ISO-dependent
Secure Boot Official media Works if the ISO is official Works if the ISO is official
Best for One clean install Control over partition scheme A toolkit with several ISOs
Risk Low Medium: wrong target disk Medium: stale ISO, extra boot layer

First: do you even need media?

Section titled “First: do you even need media?”

If the goal is to upgrade this PC in place, you do not need a USB stick at all. Microsoft ships a small downloader for exactly that:

Tool What it does When it is right
Installation Assistant downloads 26H2 and upgrades this PC in place a working PC that just needs the new version
Media Creation Tool writes a USB stick or saves an ISO you may install on another PC, or want a fallback
Update Assistant pushes the current release onto a PC Windows Update is not offering it to a stuck or blocked feature update

The Installation Assistant keeps files and apps, needs ~20 GB free plus the download, and reboots once or twice. It is the lowest-effort path — and the one most guides skip, sending people straight to USB media they do not need.

Terminal window
# confirm where you are before running any of them
Get-ComputerInfo | Select-Object WindowsProductName,WindowsVersion,OsBuildNumber
Get-Volume | Where-Object DriveLetter -eq 'C' | Select-Object @{n='FreeGB';e={[math]::Round($_.SizeRemaining/1GB,1)}}

Before you write

Section titled “Before you write”
  1. Use a USB drive you can erase. 8GB minimum; 16GB is safer for 26H2 media.
  2. Confirm the USB’s disk number in Disk Management. Writing to the wrong disk destroys data.
  3. Close Explorer windows on the USB and any backup software using it.
  4. If the USB is BitLocker-encrypted, unlock it first, then let the writer reformat it.
  5. Verify the ISO hash before writing (see the ISO page).

Media Creation Tool

Section titled “Media Creation Tool”

Use it when you want the official path and do not need custom partitions:

  1. Download the tool from Microsoft’s Windows 11 page.
  2. Accept the licence.
  3. Choose “USB flash drive” and select the drive.
  4. Let it download and write. Do not unplug the drive.
  5. Boot the target PC in UEFI mode and select the USB.

If the tool fails, do not immediately blame the USB; check free space, the ISO source and the USB controller.

Rufus

Section titled “Rufus”

Rufus is useful when you already have an ISO and want to choose GPT/UEFI explicitly:

  • Partition scheme: GPT
  • Target system: UEFI (non-CSM)
  • File system: FAT32 for broad UEFI compatibility; NTFS may require a UEFI:NTFS shim that Rufus offers.
  • Do not enable “remove requirement for 4GB+ RAM, Secure Boot and TPM 2.0” on a machine you intend to call supported.

The bypass options exist. Using them changes the support story, so we do not recommend them for a normal install.

Ventoy

Section titled “Ventoy”

Ventoy lets you copy ISO files to a USB and choose one at boot. It is excellent for a technician’s toolkit, less ideal for a single clean install:

  • Keep Ventoy itself updated; an old bootloader is a liability.
  • Keep only official, verified ISOs on the drive.
  • Some UEFI firmware is picky about the Ventoy boot entry. If the target refuses, fall back to a directly written USB.
  • Do not use Ventoy to mix a Windows installer with an untrusted “tool” ISO.

Boot checklist

Section titled “Boot checklist”
  • Firmware is UEFI, Secure Boot state is known.
  • USB appears in the one-time boot menu.
  • If the USB does not appear, try another port (rear I/O on a desktop), disable Fast Boot temporarily, or re-write the media.
  • At the Windows Setup screen, confirm the language and keyboard, then choose Custom only if you intend to manage partitions.

Sources