Windows 10: Copying file compresses it

Discus and support Copying file compresses it in Windows 10 Support to solve the problem; I'm copying some jpg photo files from one folder to another on the same drive and instead of just copying it the system compresses it first then... Discussion in 'Windows 10 Support' started by larrydonline, May 4, 2021 at 6:02 AM.

  1. Copying file compresses it


    I'm copying some jpg photo files from one folder to another on the same drive and instead of just copying it the system compresses it first then copies. Of course, it's now altered from the original file. What causes this behavior and can I stop it from happening? Thanks. Win 10 Home 20H2 build 19042.928

    :)
     
    larrydonline, May 4, 2021 at 6:02 AM
    #1
  2. temp02 Win User

    Java.nio.file - Copying files

    You can't copy a folder, thats why it generates an exception (you are trying to copy a folder using a copy file function).
    You probably need to list all the files inside that folder and copy one by one
     
  3. Wozzer Win User
    Java.nio.file - Copying files

    Issue was the above, so thanks temp02.
     
  4. Bree Win User

    Copying file compresses it

    Copying Compressed Files

    Yes, that is the way ntfs file compression works. A compressed file is decompressed as it is read. If the folder it is being copied to is on an ntfs partition and is an ntfs compressed folder, then the file will be compressed as it is written. If the destination folder is not compressed, neither will the copied file be.

    EXT4 is a file system used by Linux. Windows does not support EXT4. There are 3rd-party apps that allow Windows to read EXT4 drives, but they do not provide write access.

    The only practical way to copy a file in compressed form is to put it into a .zip archive (or .7z, or .similar) before copying it across to another drive.
     
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Copying file compresses it

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