genisoimage doubles the size of folder

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I have a folder with ~22k subfolders on it, and each subfolder can have more subfolders, up to a depth of ~7.



So I wanted to make it a single file, but not a rar or similar file, because decompressing it could take a long time. I wanted a .iso because I could mount it and access only what I need, without having to extract everything.



I used this command genisoimage --iso-level 4 -o folder.iso "folder"



The folder size was 21.7 GB but after turning it in a iso it's 43.2 GB? Is this expected?






iso







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    I have a folder with ~22k subfolders on it, and each subfolder can have more subfolders, up to a depth of ~7.



    So I wanted to make it a single file, but not a rar or similar file, because decompressing it could take a long time. I wanted a .iso because I could mount it and access only what I need, without having to extract everything.



    I used this command genisoimage --iso-level 4 -o folder.iso "folder"



    The folder size was 21.7 GB but after turning it in a iso it's 43.2 GB? Is this expected?






    iso







    share|improve this question























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a folder with ~22k subfolders on it, and each subfolder can have more subfolders, up to a depth of ~7.



      So I wanted to make it a single file, but not a rar or similar file, because decompressing it could take a long time. I wanted a .iso because I could mount it and access only what I need, without having to extract everything.



      I used this command genisoimage --iso-level 4 -o folder.iso "folder"



      The folder size was 21.7 GB but after turning it in a iso it's 43.2 GB? Is this expected?






      iso







      share|improve this question













      I have a folder with ~22k subfolders on it, and each subfolder can have more subfolders, up to a depth of ~7.



      So I wanted to make it a single file, but not a rar or similar file, because decompressing it could take a long time. I wanted a .iso because I could mount it and access only what I need, without having to extract everything.



      I used this command genisoimage --iso-level 4 -o folder.iso "folder"



      The folder size was 21.7 GB but after turning it in a iso it's 43.2 GB? Is this expected?






      iso




      iso






      share|improve this question













      share|improve this question











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