iso9660 filesystem when remade with a slight change blows its size by 100M

Posted by user1458001 on Super User See other posts from Super User or by user1458001
Published on 2012-06-15T07:04:24Z Indexed on 2012/06/16 9:18 UTC
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linux

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filesystems

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iso-image

I have an iso 9660 filesystem image in which I need to edit just one file. I copied the files using cp -avf. When the files reach the destination, the sizes increase. That must be due to the increase in block size.

But when I remake the iso9660 filesystem using mkisofs -J -U -r the sizes of the files remain the same and just a small editing in a file leads to a blow up of about 100M in the newly created iso image. I think I'm missing some option there, but I'm not able to find out in the manpage and google search. Some quick help would be greatly appreciated as I'm stuck.

My host filesystem is ext3..if that's required.

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