Just curious as to why a folder named "Mac OSX" shows up on a USB drive / Folder after being used on a mac?

  • Because it does things to it. If you look into that folder you should see some files. If I'm not mistaken it's analogues to the thumbs.db files windows creates.
    – Seth
    Dec 1, 2016 at 8:46
  • Possible duplicate of What is __MACOSX folder?
    – MJH
    Dec 4, 2016 at 5:50

1 Answer 1


This question is answered quite thoroughly in this thread:-

Link to "What-is-macosxfolder" discussion on superuser.com

To summarise, it is a folder that the Mac uses to hold meta data/resource fork information. It is hidden on the Mac but Windows displays it as a normal folder, much like the DS_Store files that can be left on Windows Network shares for Windows users to see if you browse the shares using a Mac.

  • 1
    Please don't link to another question that answers this one. The correct thing to do is to flag/vote to close as a duplicate.
    – DavidPostill
    Dec 1, 2016 at 17:58

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