How can I compress a 6GB .ISO to 4GB or less?

Suhel April 5, 2012
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I’m running low on space on my laptop right now. I have a few .iso files which I want to compress. I know Magicdisc, WinRAR and etc can do some compression but they only compress by a few hundred MB. I want to compress a 6gb .ISO file to at least 4GB (3GBwould be heavenly).

Is there any kind of magic software that would do this? Paid or Free doesn’t matter.

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  1. Suhel
    April 7, 2012 at 8:29 am

    Thanks to all the comments. I now know its not possible.

    • Hiciano
      April 9, 2012 at 1:43 am

      Have you tried the ARC compression?

      • Suhel
        April 9, 2012 at 2:00 am

        I don't know about it. Can you provide me with some info?

  2. FIDELIS
    April 6, 2012 at 10:56 pm

    Hello, have you tried DVDShrink?  It can open ISO files and compressed them.  Keep in mind that quality suffers a bit when doing this....

    http://www.dvdshrink.org/what_en.php

     

  3. Oron Joffe
    April 6, 2012 at 2:44 pm

    Suhel,
    Just to reinforce the point that others have made, you can compress certain types of material such as images, video or audio by using
    "lossy" compression, which trades off quality vs file size.
    However, non-lossy compression (that is, one where the re-expanded file is identical in every detail to the original) does not work well (or at all) on binary files which are already compressed such as .ISO files.

  4. Bruce Epper
    April 6, 2012 at 4:27 am

    Depending on what the actual contents of the .ISO are, you probably won't get the kind of compression you want.  If it is a ripped movie or a lot of .jpg photos, you will get next to no compression, but if it is a large archive of uncompressed text documents, it can compress well and the tool used won't matter as much.  Your best bet for compression will still end up being either 7-Zip or WinRAR.

    If it is a video .ISO, you can recode it into a smaller (lossy) file format to start with, or recode it for a different resolution to try to reduce the file size.

  5. RayInLV
    April 6, 2012 at 1:03 am

    I don't think if it's compressed it will function as an ISO unless it is uncompressed.   So if your goal is to fit it onto a 4g accessible dvd it probably won't work.

    • Suhel
      April 6, 2012 at 3:25 am

      actually the moderator changed the context of my question. the 6gb was just an example. All I want is to super compress any iso file. atleast if it any prgm can make an iso size to alteast 60% of its size.

  6. ha14
    April 5, 2012 at 10:52 pm

    Well if you want to keep iso intact perhaps with 7zip or KGBarchiver

    PowerIso can do also but will change the file format to .daahttp://www.downloadatoz.com/poweriso/how-to-compress-an-existing-image-file.html

    • Suhel
      April 6, 2012 at 3:24 am

      tried them all, none are able to have such high compression ration

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