Do not use IDE or SATA for your virtual disk interface. For maximum performance, set the bus type to or SCSI . If you use SCSI, ensure your controller type is set to VirtIO SCSI single . 2. Enable Write-Back Caching

It supports built-in, space-efficient snapshots, allowing you to save and revert states instantly.

If you are running QEMU on a Windows host and experiencing corruption when the disk expands:

In this post, I’m going to show you the method to get a working Windows 10 Qcow2 image and the two specific tools that ensure it actually boots on first try.