<driver name="qemu" type="qcow2" cache="none" io="native"/> Over time, your Windows 10.qcow2 file grows. Even if you delete files inside Windows, the image file on your Linux host stays large. To reclaim space:
Inside Windows: Run Defragment and Optimize Drives -> Optimize (This allows the guest to mark free space).
-drive file=Windows 10.qcow2,format=qcow2,if=virtio,aio=native,cache.direct=on For libvirt (virt-manager), edit the VM XML:
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