Apparent disagreement between df and cp.

[peasthope@shaw.ca]

How can df report MiBs available while cp reports 
"No space left on device"?

peter@dalton:~$ df /media/43*
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sdd1               498648     18840    479808   4% /media/4345-A417
peter@dalton:~$ ls -l Mail.Text
-rw------- 1 peter peter 1511 Jun 27 20:28 Mail.Text
peter@dalton:~$ cp Mail.Text /media/43*
cp: cannot create regular file `/media/4345-A417/Mail.Text': No space left on device

Thanks for any ideas,             ... Peter E.

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