Preallocate by default

  echo "ERROR: Not enough free space to create a 4 GB system disk." && exit 87

fi

if [ "$ALLOCATE" != "Z" ]; then

  # Cannot use truncate here because of swap partition

  if ! fallocate -l "${SYSTEM_SIZE}" "${SYSTEM}"; then

    rm -f "${SYSTEM}"

    echo "ERROR: Could not allocate a file for the system disk." && exit 88

  fi

else

  GB=$(( (SYSTEM_SIZE + 1073741823)/1073741824 ))

  echo "Install: Writing ${GB} GB of random data, please wait.."

echo "Install: Allocating diskspace..."

dd if=/dev/urandom of="${SYSTEM}" count="${SYSTEM_SIZE}" bs=1M iflag=count_bytes status=none

fi

# Check if file exists

if [ ! -f "${SYSTEM}" ]; then

    echo "ERROR: System disk does not exist ($SYSTEM)" && exit 89