Qemu/kvm provides you with a plethora of ways to configure your storage devices. Yet no other type of device shows such a variance in its performance, with disk I/O throughput anywhere from stellar to abysmal using the very same hardware.
Microsoft has done it again! During the last Windows 10 upgrade, it has overwritten the user configuration and enable “Fast Startup”. Why in the world is Microsoft messing around with user preferences?
In an attempt to make the qemu -drive command line options more accessible, here is an extract from the qemu-system-x86_64 man page. You can get the complete man page by entering the following in a terminal window: man qemu-system-x86_64