What can cause a difference of 3 gigabytes on two identical trees?

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I've just copied a dir tree to another disk with cp -a. This tree is ~70GB big with millions of files, and diff was taking forever to finish, so I was looking for other methods to compare the dirs.



First I launched find on both the dirs and the result was the same.



After I launched du -h and one dir gave 72GB, the other 75. What can cause this difference supposing the copying process went well?
Disk block size is the same, 4096. One partion is EXT3, the other EXT4, could be this?






linux ext4 disk ext3







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    I've just copied a dir tree to another disk with cp -a. This tree is ~70GB big with millions of files, and diff was taking forever to finish, so I was looking for other methods to compare the dirs.



    First I launched find on both the dirs and the result was the same.



    After I launched du -h and one dir gave 72GB, the other 75. What can cause this difference supposing the copying process went well?
    Disk block size is the same, 4096. One partion is EXT3, the other EXT4, could be this?






    linux ext4 disk ext3







    share|improve this question







    New contributor




    cdarwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















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      up vote
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      down vote

      favorite











      I've just copied a dir tree to another disk with cp -a. This tree is ~70GB big with millions of files, and diff was taking forever to finish, so I was looking for other methods to compare the dirs.



      First I launched find on both the dirs and the result was the same.



      After I launched du -h and one dir gave 72GB, the other 75. What can cause this difference supposing the copying process went well?
      Disk block size is the same, 4096. One partion is EXT3, the other EXT4, could be this?






      linux ext4 disk ext3







      share|improve this question







      New contributor




      cdarwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I've just copied a dir tree to another disk with cp -a. This tree is ~70GB big with millions of files, and diff was taking forever to finish, so I was looking for other methods to compare the dirs.



      First I launched find on both the dirs and the result was the same.



      After I launched du -h and one dir gave 72GB, the other 75. What can cause this difference supposing the copying process went well?
      Disk block size is the same, 4096. One partion is EXT3, the other EXT4, could be this?






      linux ext4 disk ext3




      linux ext4 disk ext3






      share|improve this question







      New contributor




      cdarwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







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      cdarwin is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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