A1181, cmd-s, power on
mount -uw /, rm /var/db/.applesetupdone, shutdown -h now

sudo asr restore --source /<path_to_file>/Snow_Leopard_10.6.8.dmg --target /Volumes/<destination> --erase --verbose --noprompt --noverify --buffers 1 --buffersize 32m --puppetstrings