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Here's my output of df -h:

[root@box root]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                      1.8T  231G  1.5T  14% /
/dev/sda3              92M   27M   61M  31% /boot
tmpfs                 3.9G     0  3.9G   0% /dev/shm
/dev/sdc1             7.6G  6.3G  1.3G  83% /mnt/backup

I have a drive plugged in that I use as a backup which is aptly mounted at /mnt/backup. I've been getting errors that I can't copy files to this directory. So I tried to see what's using up the space, and therein lies the confusing part:

[root@box backup]# pwd; ls -a
/mnt/backup
.  ..

What's up with that‽ There are no files but 6.3 GB is being used?

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1  
Try checking the file system. –  Dennis Feb 25 '13 at 14:05
    
Show the output of du -s /mnt/* or du -s /mnt/backup/*`. –  ott-- Feb 25 '13 at 14:53
    
@ott : [root@box backup]# du -sh /mnt/* 4.0K /mnt/backup –  LaceCard Feb 25 '13 at 15:17
1  
Hmm. Could superuser.com/questions/289678/du-vs-df-output be the answer? –  ott-- Feb 25 '13 at 15:41

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