missing free space



On a partition mounted as /tmp on /dev/hda2 df report

df -h | grep -E "Size|hda2"
Filesystem Size Used Avail Use% Mounted on
/dev/hda2 479M 454M 0 100% /tmp

and total space used by /tmp directory is

du -sh /tmp/
1.4M /tmp/

Why this differences between used space reported df and du appear ?


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