Discard/Trim Support: Ensure "Discard" is enabled on the drive settings to allow the Qcow2 file to shrink when files are deleted inside the VM. Best Practices for Stability To keep your Windows 10 Qcow2 download running smoothly:

: Skips the 20–30 minute Windows installation and initial setup.

If you already downloaded a Qcow2 file that won’t work, here is the diagnostic checklist to get it fixed.

qemu-img create -f qcow2 win10.qcow2 50G

qemu-img create -f qcow2 windows10.qcow2 50G

The Windows 10 image does not contain the VirtIO SCSI or IDE drivers needed to talk to the QEMU virtualized disk controller.

: Unlike "raw" images, QCOW2 (QEMU Copy-On-Write) files only grow as you add data, making them more storage-efficient. How to Get a Stable Windows 10 QCOW2