：使用 qemu-img 工具进行压缩转换：
Users can save the state of Windows 7 before making risky changes. Compression: Images can be compressed for easier distribution. AES Encryption: Supports built-in software encryption. 🛠️ Usage Scenarios in 2021
If you are using VirtualBox or VMware, you are likely using VDI or VMDK. However, for a production KVM hypervisor, qcow2 offers features that matter deeply for Windows 7:
qemu-img convert -f vmdk -O qcow2 existing-image.vmdk new-image.qcow2
For DevOps engineers maintaining ancient industrial control systems (ICS), healthcare machines, or POS terminals, a qcow2 snapshot is a lifesaver. You can roll back malware infections instantly.
Download the Sysinternals utility SDelete inside the Windows VM and run the following command from an elevated Command Prompt to write zeros to all unused sectors: sdelete64.exe -z c: Use code with caution.
Note: Without these two updates, modern guest agent binaries will throw digital signature verification errors. System Slimming and Image Shrinking
: Running older applications that are incompatible with Windows 10 or 11.
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