New submission from Stéphane Archer <archersteph...@gmail.com>:

I use shutil.copytree to copy photos from many sd cards to a hard drive.
I use thread for each sd card. then I check if the content has been copying 
correctly with filecmp.cmpfiles with shallow to false. and surprise!!!
some files are not identical. usually, just one byte has not been properly 
copying

----------
components: IO
files: diff.png
messages: 356403
nosy: Stéphane Archer
priority: normal
severity: normal
status: open
title: shutil.copytree fail to copy some bytes
type: behavior
versions: Python 3.7
Added file: https://bugs.python.org/file48707/diff.png

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38772>
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