diskspace - Linux du directory size, how is this possible? -

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I have a job named Libre SCRATCH I see this 

  ubuntu @ memo: ~ $ du -s joblibSCRATCH 2831128 joblibSCRATCH   
 This is 2831128 kilobytes, which is 2.836024 GB. I see this:  
  ubuntu@memo: ~ $ du -hs joblibSCRATCH 2.7G joblibSCRATCH   
 So the two are saying that this folder is both 2.7 GB and 2.83 GB How can this be? If it makes any difference then I am using a virtual hard drive on the cloud server.   
 
 
  2831128/1024 = 2764.7734375 2764.7734375 / 1024 = 2.69997406005859375

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