Windows 10: Why does Windows 10 require 2x the space to copy a file to a Drive that has compression...

Discus and support Why does Windows 10 require 2x the space to copy a file to a Drive that has compression... in Windows 10 Ask Insider to solve the problem; This becomes apparent when transferring large game folders. If I transfer a 60GB game to a drive that has compression enabled, that drive needs 120GB... Discussion in 'Windows 10 Ask Insider' started by /u/KarrotPies, Apr 9, 2020.

  1. Why does Windows 10 require 2x the space to copy a file to a Drive that has compression...


    This becomes apparent when transferring large game folders. If I transfer a 60GB game to a drive that has compression enabled, that drive needs 120GB of space just for the transfer. I was wondering why, with 100GB of free space, a 60GB game would give an out of space message.

    So why does compression require 2x the space to copy?

    submitted by /u/KarrotPies
    [link] [comments]

    :)
     
    /u/KarrotPies, Apr 9, 2020
    #1

  2. Files in C: drive automatically compressing?

    As you may already know, if this feature is on, every new folder/file you add starts off automatically compressed. If you would like to turn it off for the whole drive, kindly follow these steps:

    • Start File Explorer . In the left pane, right-click on the drive that you would not want to be compressed.
    • Click Properties.
    • Make sure that the Compress this drive to save disk space box is unchecked.
    • Click OK then Apply.

    Let us know if you need further assistance.
     
    Darian Tab, Apr 9, 2020
    #2
  3. AlashZU Win User
    Copied file takes 2x hard drive space

    I have a problem in Windows 10.

    When I copy a file to a drive, it takes twice as much space than its size.

    During the copy process, it firstly takes all of its size from the free disk space, then it continuously takes the same amount until the copy is finished.

    The result is, that when I copy 1GB file to my HDD, I have 2GB less of free space. Do you have any idea, what can be the reason?
     
    AlashZU, Apr 9, 2020
    #3
  4. mamyot0 Win User

    Why does Windows 10 require 2x the space to copy a file to a Drive that has compression...

    NTFS Compression of copied files

    I'm experiencing an odd issue in Windows 10 that involves copying files that are compressed using the NTFS filesystem to another folder that has the compression flag set (so that when the file is
    copied, not moved, it is compressed in the destination folder).

    The issue is that when the file is copied to the folder, the filesystem is not releasing the uncompressed copy of the file (as it should) after compressing. Thus, the disk is recognizing that
    double the space is needed to store the file (e.g. if the file was 500MB, the remaining capacity for the disk will be 1000MB less). In Windows 7, this behavior is not being seen (i.e. after the file is compressed, the uncompressed file is released,
    showing the correct amount of space used.)

    I've experienced this on several (actually all) Windows 10 installs, so I'm wondering if anybody else has seen this.

    Of course, restarting the computer seems to correct the reported free disk space remaining, but while in a session, I've had to decompress a file manually, then recompress it to have the filesystem report the correct size. The system believes that much more
    disk space is being consumed that what is really there, and it is leading to insufficient disk space errors (in testing out the problem, I made a dummy partition and copied the compressed file to it).

    I would write this off as a corrupted installation, but I've seen it on good installs also. I've also reported the problem in the Windows feedback community, in case it is an actual bug.

    Thanks for any help.
     
    mamyot0, Apr 9, 2020
    #4
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Why does Windows 10 require 2x the space to copy a file to a Drive that has compression...

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