Windows 10qcow2 -

# Add 20GB to the existing disk image qemu-img resize windows10.qcow2 +20G Use code with caution.

The QCOW2 file is huge even though the guest shows free space. Fix: Windows 10 doesn't TRIM automatically on some QEMU versions. Run the PowerShell Optimize-Volume command weekly. windows 10qcow2

The list will be empty because the VirtIO controller isn't recognized yet. Click > Browse . # Add 20GB to the existing disk image

Create a base image (golden master) and never modify it: Run the PowerShell Optimize-Volume command weekly

Start by creating a virtual disk container using the QEMU Command Line Tools : qemu-img create -f qcow2 windows10.qcow2 50G Use code with caution. 2. The VirtIO Driver Requirement

When the Windows 10 setup wizard asks "Where do you want to install Windows?", the drive list will be completely blank. This is expected because Windows cannot see the VirtIO virtual hard drive yet. Click .

qemu-img create -f qcow2 -o preallocation=metadata windows10_perf.qcow2 60G Use code with caution. Cluster Size Customization