Make USB Installer Windows 10 from ISO

Posted on January 16, 2021 by macrae

Some case Rufus could damage to your USB Flash disk. I got this bad experience with my new USB Flash disk suddenly write protected after created bootable Windows Installer with Rufus. But luckily, it is lifetime warranty so I can get replacement from authorized service center.

If you had the Windows 10 ISO installer already, what you need to do is:

  • Format USB Flashdisk with Disk Management with FAT32 format, and set as an active partition
  • Mount the Windows 10 ISO Files
  • Copy all files using robocopy except file that has size larger than 4GB
    • robocopy <ISO mounted drive>: <flash drive>: /s /max:3800000000
  • Split copy the large file using dism tool
    • Dism /Split-Image /ImageFile:<ISO mounted drive>:\sources\install.wim /SWMFile:<flash drive>:\sources\install.swm /FileSize:3800

Reference:

https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/install-windows-from-a-usb-flash-drive

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