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qemu-img convert -O qcow2 windows10.qcow2 windows10_optimized.qcow2 This removes "holes" and reduces file size dramatically (from 80GB to ~10-15GB actual usage).
Using the qemu-img utility (available on Windows, Linux, and macOS via Homebrew):
# Convert from VDI to QCOW2 qemu-img convert -f vdi -O qcow2 Windows10.vdi Windows10.qcow2 qemu-img convert -f vmdk -O qcow2 Windows10.vmdk Windows10.qcow2 Convert from raw IMG or VHD qemu-img convert -f raw -O qcow2 Windows10.img Windows10.qcow2
If you have landed on this page, you are likely searching for a direct, ready-to-use Windows 10.qcow2 file. Whether you are a developer testing cross-platform applications, a Linux enthusiast trying to run legacy Windows software, or a system administrator spinning up a virtual lab, the QCOW2 (QEMU Copy-On-Write 2) format is your golden ticket to high-performance virtualization.
qemu-system-x86_64 \ -enable-kvm \ -cpu host \ -smp 4 \ -m 4096 \ -drive file=windows10.qcow2,format=qcow2 \ -drive file=/path/to/Win10_22H2_English.iso,media=cdrom \ -boot menu=on Proceed through the Windows installation wizard. This will take ~15 minutes. Once Windows is installed, shut down the VM. Convert the image to discard unused space:
Leave a comment below, and our virtualization engineers will assist you. This article is for educational purposes. Always use licensed copies of Windows 10 in compliance with Microsoft’s EULA.