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Re: Migrations to xorriso

From: Thomas Schmitt
Subject: Re: Migrations to xorriso
Date: Wed, 19 May 2010 21:34:28 +0200


Isaac Dupree wrote:
> What size range are the whole images? 

The minimum output of grub-mkrescue 1.98 with
xorriso is 1544192 bytes.
grub-mkisofs: 1550336
genisoimage:  1859584 (-307200 with -no-pad)

One may add lots of other files, of course.

> Also I guess no one compresses whole ISOs

It makes few sense to compress the ISO as a
whole. But one could compress some files in it.

One could implement a reader for H. Peter Anvin's
zisofs format in GRUB's ISO 9660 reader - if not
present already.
zisofs is a transparent content compression of
single files. A reader is implemented in the
Linux kernel. See macro CONFIG_ZISOFS in
An authorised description is given in
doc/zisofs_format.txt of xorriso resp. in
The ISO 9660 directory tree stays uncompressed.
Compressed and uncompressed files can be mixed.

xorriso can produce zisofs compressed data files
on the fly (needs zlib).
A grub-mkrescue 1.98 image with all files
compressed has 884736 bytes. But one would have
to leave those files uncompressed which are
needed for reading ISO 9660 and zisofs

Have a nice day :)


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