During Windows Setup, when it asks where to install, click "Load Driver" and navigate to the virtio folder (e.g., viostor/w10/amd64 ). 5. Converting Existing Windows Images to qcow2
Before we begin, make sure you have:
Disable Cortana, background telemetry, and cloud consumer features within the Windows 10 Group Policy Editor. Ensure the QEMU Guest Agent service is installed and running inside the guest OS. Summary Matrix: QCOW2 vs. Other Formats RAW ( .img / .raw ) VMDK (VMware) Allocation Dynamic (Thin) Thick (Pre-allocated) Dynamic or Thick Performance High (Optimized) Maximum (Native) Moderate on KVM Native Snapshots Host System Compatibility QEMU, KVM, Proxmox VMware, VirtualBox Conclusion windows 10qcow2
For those who prefer the terminal, a single QEMU command can launch the installer:
If you'd like, I can provide a for a specific platform like Proxmox , Unraid , or macOS (UTM) . Which one are you using? During Windows Setup, when it asks where to
The format only writes changes to the disk, leaving base templates untouched.
kvm -m 4096 -smp cpus=4 \ -drive file=windows10.qcow2,if=virtio,index=0,media=disk \ -cdrom /path/to/windows10.iso \ -drive file=/path/to/virtio-win.iso,media=cdrom,index=3 \ -net nic,model=virtio -net user \ -vga qxl -spice port=5900,disable-ticketing=on \ -boot d Use code with caution. Key Parameters Explained: Ensure the QEMU Guest Agent service is installed
It supports built-in, end-to-end encryption at the disk image level.
qemu-img resize win10.qcow2 +20G
| Feature | QCOW2 | RAW | | :--- | :--- | :--- | | | Sparse/thin-provisioned (efficient) | Pre-allocated (space-consuming) | | Snapshots | Yes, built-in and efficient | No | | Performance | Slightly lower overhead due to copy-on-write | Near-native, no overhead | | Encryption | Yes (AES encryption) | No | | Best For | General-purpose, testing, lab environments | Database servers, high-I/O workloads |
