: qemu-img create -f qcow2 -o preallocation=metadata windows7.qcow2 40G
Once the image is running, disable modern features that "hammer" the virtual disk: windows 7qcow2 best
: You will need to load these during the Windows 7 installation process (via a mounted ISO) so the installer can "see" the qcow2 drive. windows 7qcow2 best
To achieve the best results, you must focus on 1. Use VirtIO Drivers (The "Must-Have") windows 7qcow2 best