Windows 10.qcow2: The Essential Guide to KVM Virtualization The file extension .qcow2 (QEMU Copy-On-Write version 2) represents a high-performance, flexible virtual disk format primarily used by the QEMU and KVM hypervisors. A Windows 10.qcow2 file is a pre-configured or installed virtual machine (VM) disk containing the Windows 10 operating system, optimized for rapid deployment in Linux-based virtualization environments. Why Use the QCOW2 Format for Windows 10?
# Inside Windows: sdelete -z c:
# Then on host:
qemu-img convert -O qcow2 windows10.qcow2 windows10_shrinked.qcow2
Convenience: Using a .qcow2 file bypasses the lengthy OS installation process. You can simply "Import Drive" in your virtualization software and boot straight into the Windows environment. Windows 10.qcow2
Appendix — Quick commands
virt-manager and qemu-kvm.Windows 10.qcow2 using qemu-img.Windows10.qcow2qemu-system-x86_64 \
-drive file=Windows10.qcow2,format=qcow2 \
-enable-kvm \
-cpu host \
-smp 4 \
-m 4096 \
-netdev user,id=net0 \
-device e1000,netdev=net0 \
-vga qxl \
-display spice-app \
-usb \
-device usb-tablet