get partition start

# parted -s /dev/sda unit s print | grep -iE -A 100000 "[[:space:]]*Start[[:space:]]*End[[:space:]]*" | sed -e "s/^.*[[:space:]]*Start[[:space:]]*End[[:space:]]*.*$//g" | sed "/^$/d" | awk -F" " '{print $2}' | sed -e "s/s$//g" | sort -n | head -n 1