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how to see which compression level has an archive

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fehl flis
2014-02-28
2014-02-28
  • fehl flis
    fehl flis
    2014-02-28

    I'm a fan of cleaning, I like to clean my room, my stomach, my mind and my hard drive.
    That's why I love 7-zip so much, it gives me a feeling of order and tidiness in my files. thx 4 dis.

    But how can I see which compression level an archive has?
    Sometimes I can't be sure which I used for a certain archive or when I download 7zip files I don't know if it was compressed with "normal" or "ultra".
    Is there a way to find this out except uncompressing it and recompress it with ultra just to be sure?

     
  • Igor Pavlov
    Igor Pavlov
    2014-02-28

    There is no such information in 7z file.
    But there are some properties that can show used level.
    1) If there are DLL/EXE files, then 7z uses
    - BCJ method for normal/fast
    - BCJ2 method for maximum/ultra
    2) You can look the value of dictionary size (if size of file set is big):
    - Normal = 16 MB
    - Maximum = 32 MB
    - Ultra = 64 MB