With Redhat linux enterprise 6 system the df and du commands allow you to see the mnt capacity, as shown below. What causes the capacity shown to not be the same?
redhat: ~ # df -h / mnt
Filesystem Size Used Avail Use% Mounted on
/ dev / sdb 1008M 514M 443M 54% / mnt
redhat: ~ # du -hs / mnt
40k / mnt
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