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I copied a folder to a different location on the same disk, and I noticed that both its size as well as the size on the disk is different in the new location.

So, I tried using TeraCopy to copy the folder with the "Verify files after copy" option checked. However, the sizes are still different!

enter image description here

As can be seen in the screenshot above, both the size and the size on disk are different in different locations!!

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    run defrag on the drive, see if it changes the sizes. Windows frags files when copied, defrag may solve the size differences.
    – Moab
    Apr 8, 2020 at 23:09
  • Thanks. I just did so. There is still the same difference in the actual folder size (828 Bytes)! I do not know if I should worry about this small difference. Apr 9, 2020 at 9:18
  • It might be a bit of a pain with an 8GB folder, but there are plenty of utilities to create checksum files in bulk. I might suggest creating checksums for the items in the entire orginal folder and then run those checksums against the items in your copied folder. It's only a possibility but some of the files may have had issues during copying and lost a few bytes. Apr 9, 2020 at 23:18
  • Thanks. The tool I used to copy (TeraCopy) already does checksum for every single file it copies. No issues was reported. Apr 10, 2020 at 0:22

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In order to investigate the difference, I wrote a small Java program that compares all the files in all folders and sub-folders, recursively. It turned out that the difference is only in desktop.ini files.

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