How to create Windows 10 USB setup disk from ISO using Linux?

The Windows ISO setup image downloaded from Microsoft can actually be directly extracted to a USB stick of FAT32 partition. Almost all PC today can boot this USB drive.

But the new Windows 10 setup ISO image contains special a source file named install.wim, which is larger than 4GB. So you have to split setup sources into two partitions. The first one is UEFI of FAT32 format, the second must be a NTFS partition larger than 6.5GB. That says you have to find a USB drive have at least 7~8GB.

To create this Windows 10 setup USB drive, please login your Linux distro. Both Fedora and Ubuntu should work for this article.

The creation steps:

  1. Open Disks Utility from your Fedora desktop and plug a empty USB drive (ensure at least 8GB).
  2. Create a FAT32 partition using the Disks Utility named UEFI of 1GB size.
  3. Create a second partition of NTFS format occupies the rest USB drive space, here we say 7GB.
  4. Download the Windows 10 ISO image from Microsoft official download page.
  5. Mount the Windows 10 ISO from the Disks Utility (from the left side option menu on the top) so that you will see the content of the ISO.
  6. Copy all files except the sources directory from the Windows 10 ISO image into the first FAT32 partition.
  7. Create a sources directory in the first FAT32 partition, then go back in the ISO image and copy it's sources/boot.wim file to that sources directory in the first FAT32.
  8. Copy the entire sources directory into the NTFS partition on the USB drive. Then remove the sources/boot.wim from the NTFS partition, which is duplicated in the FAT32.
  9. Stop and eject the USB drive and reboot from it.
  10. Boot the USB and start the installation.

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