Windows 8 and 8.1 Forums

C drive system compression 4.3 GB could be saved

  1. #1

    Hafnarfjörður IS
    Posts : 4,374
    Linux Centos 7, W8.1, W7, W2K3 Server W10

    C drive system compression 4.3 GB could be saved

    Hi there

    would deleting the system compression data on drive C: via disk cleanup tools cause any problems.

    Anybody have any idea on what it actually DOES.


    Attached Thumbnails Attached Thumbnails compression.png  

      My System SpecsSystem Spec

  2. #2

    Posts : 2,612
    Windows 3.1 > Windows 10

    In the old days > That would compress unused rarely used system files on drive C and allow 4.3 GB of more free space on drive C

    Although you are showing two options - I have not seen in 8.1 > delivery and compression
      My System SpecsSystem Spec

  3. #3

    I don't believe it deletes anything at all. It merely uses NTFS compression on a number of older files that presumably won't be frequently accessed. But "old" is based only on the last time the file was updated. Lacking a last access time stamp (disabled by default on recent versions of Windows) there is nothing else to go by. Such files may be frequently accessed and performance impaired by compressing them. And 4.4 GB seems of little consequence on a modern drive.
      My System SpecsSystem Spec

  4. #4

    Posts : 1,875
    Windows 10 Pro Prieview x64

    It is only on Window 10, not 8.x and only if you have a SSD. It doesn't delete anything but for me compressed Windows by 85% and Program Files by 90%.

    This saved me 13GB making my Windows 10 install (excluding pagefile etc) just under 3GB (smaller than the ISO I installed it from). I've got a small disk so it was worth it for me.

    Some pictures here
      My System SpecsSystem Spec

  5. #5

    Posts : 2,612
    Windows 3.1 > Windows 10

    It compressed the drive
      My System SpecsSystem Spec

C drive system compression 4.3 GB could be saved

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