it seems very hard to access the physical drive directly from qemu. besides its extremely sloow (qemu-sparc).
I already did wipe free space, so qcow2 image is quite small.
would be nice to pipe qemu-img output directly to dd, is that possible?
edit: I tried this as a test:
qemu-img convert -O raw /home/debian/qemuimage.qcow2 |dd of=test
however it didn't work. the problem is in qemu-img, how to redirect its output?
dd seems to accept piping just fine
edit2: it seems they will never add that feature: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=513451