mkisofs -o autounattend.iso -J -r autounattend/
| Feature | QCOW2 (Recommended) | Raw Format | | :--- | :--- | :--- | | | Supported – Allows saving and restoring VM states effortlessly. | Not supported. | | Storage Efficiency | Sparse/thin provisioning – File starts small and grows as data is added. | Pre-allocated – Uses the full configured size immediately. | | Advanced Features | Supports Zlib compression and AES encryption for data at rest. | None. | | Performance | Slightly slower for I/O-intensive tasks due to mapping overhead. | Slightly faster for raw I/O performance. | Windows 7 Qcow2
Use the virt-install command to orchestrate the installation: mkisofs -o autounattend
This comprehensive guide covers everything you need to know about creating, configuring, and optimizing a Windows 7 QCOW2 virtual disk. Why Use QCOW2 for Windows 7? | Pre-allocated – Uses the full configured size
: Many deployments involve converting an aging physical Windows 7 desktop into a virtual machine. This requires running a tool like Sysinternals to create a Microsoft image, followed by running qemu-img convert -f vpc -O qcow2 win7.vhd win7.qcow2 on a Linux host to finalize the adaptation. Windows 7.qcow2 - Google Groups
The physical file grows dynamically as data is written inside the guest OS. A 100 GB virtual disk may only occupy 15 GB on the host disk initially.