differnt results between df and ls

[Tom Brown <tom@xxxxxxxx>]

Hi

this is more than likely a general linux question but on a CentOS4 box 
whats going on here?

# ls -al foo.txt
-r--r--r--  1 xxx xxx 1373149856 Mar 28 04:34 foo.txt

# du -sh foo.txt
808M    foo.txt

any ideas ?
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