Fix Etcher Windows ISO Missing Partition Table

Fix Etcher Windows ISO Missing Partition Table | Generated by AI

Home 2026.07

Question: Why does balenaEtcher say “missing partition table” when flashing Win11_25H2_English_x64_v2.iso on Mac, and what should you do?

Answer:

This happens because Windows ISO files are not hybrid boot images.

Etcher is designed mainly for images like:

Ubuntu ISO
Debian ISO
Raspberry Pi images

Those contain a partition table inside the image:

ISO
 |
 +-- GPT/MBR partition table
 |
 +-- EFI partition
 |
 +-- filesystem

Windows ISO is different:

Windows ISO
 |
 +-- boot files
 +-- sources/install.wim
 +-- setup.exe

It is an installation DVD image, not a raw disk image.

So Etcher sees:

No partition table found

and warns you.

Can you continue and flash anyway?

You can click:

Continue

but for Windows installation USB, it is not the recommended path.

The result may be:

USB appears in BIOS but does not boot
Lenovo Xiaoxin says:

No bootable device

UEFI cannot find Windows installer

Better method on Mac: use `wimlib` (recommended)

For Windows 11 25H2 ISO:

Win11_25H2_English_x64_v2.iso

do this:

1. Install tools

brew install wimlib

2. Format USB

Find USB:

diskutil list

Example:

/dev/disk2

Erase:

diskutil eraseDisk MS-DOS WIN11 GPT /dev/disk2

3. Mount ISO

Double click:

Win11_25H2_English_x64_v2.iso

Example:

/Volumes/CCCOMA_X64FRE_EN-US_DV9

4. Copy files

Copy everything except install.wim:

cp -av /Volumes/CCCOMA_X64FRE_EN-US_DV9/* /Volumes/WIN11/

Remove large file:

rm /Volumes/WIN11/sources/install.wim

5. Split install.wim

wimlib-imagex split \
/Volumes/CCCOMA_X64FRE_EN-US_DV9/sources/install.wim \
/Volumes/WIN11/sources/install.swm \
3800

Result:

install.swm
install2.swm
install3.swm

Now USB structure:

USB
 |
 +-- EFI
 |
 +-- boot
 |
 +-- setup.exe
 |
 +-- sources
       |
       +-- install.swm
       +-- install2.swm

This is exactly what Windows Setup expects.

Another easier GUI option

Use:

Rufus official website

but Rufus only runs on Windows.

If you have access to your Ubuntu/MacBook running Windows VM, Rufus is probably the easiest.

For your setup:

MacBook Pro 2017
        |
        | create USB
        v
Lenovo Xiaoxin UEFI laptop
        |
        v
Windows 11 25H2

I would not use Etcher for this ISO. Use the wimlib method. It is the same approach Microsoft uses for UEFI Windows installation media.

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