Re: Padding and filesystem size in debian-live-9.2.0-amd64-cinnamon.iso
On Tue, Nov 07, 2017 at 08:59:37PM +0100, Thomas Schmitt wrote:
>Hi,
>
>while inspecting debian-live-9.2.0-amd64-cinnamon.iso i wondered why its
>ISO 9660 filesystem size is smaller than its image file size.
>That's a problem with the advise how to verify ISOs on DVD or USB stick
> https://www.debian.org/CD/faq/#verify
>because programs "isosize" or "./check_debian_iso" will use the filesystem
>size for computing checksums.
>
>The file /.disk/mkisofs in the ISO tells the reason:
>xorriso was used in its native command mode, not in its mkisofs emulation.
>This mode by default does not count the padding as part of the filesystem.
>
>To change to the desired behavior one would have to give command
>
> -padding included
>
>or, because the image will never fit on a CD, it is safe to disable padding
>and to save 300 KiB of image file size:
>
> -padding 0
>
>The command may be given at any position in the xorriso command list.
ACK, thanks! I'll get this fixed up in live-wrapper.
--
Steve McIntyre, Cambridge, UK. steve@einval.com
"Yes, of course duct tape works in a near-vacuum. Duct tape works
anywhere. Duct tape is magic and should be worshipped."
-― Andy Weir, "The Martian"
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