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Mac create Windows Bootable USB 2022

I havent seen much documentation about creating a bootable Windows 10 / 11 USB. So I decided to create my own.

๐Ÿ”— Requirements

๐Ÿ’พ Step 1: Install Required Software

The first thing we need is the iso file for Windows. It can be downloaded for free from the microsoft website: https://www.microsoft.com/en-ca/software-download/windows10ISO

We also need to use Homebrew to install wimlib

brew install wimlib

๐Ÿ’ฝ Step 2: Find & Format USB

We need to run the disk utility to find the USB.

diskutil list 

We should get a result that looks something like this: (Remeber your USB might not be disk2)

/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                      FAT32 USBKEY                  16 GB      disk2

We need to format the USB to make sure a computer can boot from it. Replace the disk2 with the number of your

diskutil eraseDisk MS-DOS "WIN" GPT /dev/disk2

๐Ÿ‘ฏโ€โ™€๏ธ Step 3: Mount ISO & Copy Files

Mount the iso file. Double click the iso file to mount or run the code to mount it. It should be mounted as something like CCCOMA_X64_FRE_EN-US_DV9.

Mounted ISO

Copy the files from the mounted iso file to the USB. This seems You should notice an error that install.wim is too large to copy over to the USB. This will be fixed in the next step.

โœจ Step 4: Add Install.wim

The maximum filesize for FAT32 is 4GB and install.wim is ~5 GB in size. To get around this we can use a tool called wimlib to slice up the file into smaller portions.

wimlib-imagex split /Volumes/CCCOMA_X64FRE_EN-US_DV9/sources/install.wim /Volumes/WIN/sources/install.swm 4000

The parameters of the command are:

wimlib-imagex split 1 2 3

1: Location of input file from Mounted ISO (/Volumes/VolumeName/sources/install.wim)

2: Location of file output location on USB (/Volume/USBName/sources/install.swm) The output file format is no longer wim but rather swm for split wim

3: Split size in MB (4000)

๐Ÿงผ Cleanup

Congratulations you've successfully created a bootable Windows 10 USB! Just unmount the drives and you're done.

diskutil unmountDisk /dev/disk2