graphic: 0.850
files: 0.784
device: 0.762
semantic: 0.729
network: 0.714
other: 0.457
socket: 0.444
performance: 0.384
boot: 0.372
vnc: 0.259
debug: 0.233
PID: 0.231
permissions: 0.223
KVM: 0.169

qemu-img create  will silently overwrite existing image
Description of problem:
If file exists, it is silently overwritten, causing loss of data. oups.