swapon: / swapfile: прочитать заголовок swap не удалось: неверный аргумент

#sudo dd if=/dev/zero of=/swapspacefile bs=1M count=2048k 0+0 records in 0+0 records out 0 bytes (0 B) copied, 0.000417928 s, 0.0 kB/s #chmod 600 /swapspacefile mkswap: error: swap area needs to be at least 40 KiB Usage: mkswap [options] device [size] Options: -c, --check check bad blocks before creating the swap area -f, --force allow swap size area be larger than device -p, --pagesize SIZE specify page size in bytes -L, --label LABEL specify label -v, --swapversion NUM specify swap-space version number -U, --uuid UUID specify the uuid to use -V, --version output version information and exit -h, --help display this help and exit #sudo mkswap /swapspacefile 

но он бросает ниже, когда я возбуждаю,

  swapon: /swapfile: insecure permissions 0644, 0600 suggested. swapon: /swapfile: read swap header failed: Invalid argument