I'd like to report a strange problem. I was
        backing up my desktop last night to an external usb disk last
        night. The backup failed to complete because I completely filled
        up the disk. 
        
        df -h
        /dev/sdf1       1.4T  1.4T     0 100% /media/dz/5540d70d-...
        
        So this morning I deleted (using sudo rm -rf) an old directory
        on the usb disk which had about 30 GB of data in it. Now the
        problem is that df still reports the disk is completely full --
        even after rebooting.
    
        /dev/sdf1       1.4T  1.4T     0 100% /media/dz/5540d70d-...
        
        Can someone please explain to what is going on here?
        
        Thanks
        
        David Zuccaro
        
      BSc
        (Chemistry, University Of Melbourne), GradDipCompSci (Monash),
        GradDipEd (Melbourne)