The qcow2 format uses a copy-on-write strategy. When you take a snapshot of a running Windows 10 VM, qcow2 only records changes made after the snapshot. This is incredibly space-efficient and allows for rapid rollback—perfect for testing Windows updates or malware analysis.
The boot sector (MBR or GPT) was not preserved correctly. Solution: Use qemu-img convert with no additional flags. If the issue persists, boot a Windows recovery ISO and run bootrec /fixmbr and bootrec /rebuildbcd . windows 10qcow2
Start a temporary virtual machine to perform the installation. You must attach both the Windows 10 ISO and the VirtIO driver ISO. The qcow2 format uses a copy-on-write strategy
Sharing pre-activated Windows 10 QCOW2 images is piracy. Do not do it. windows 10qcow2