How to create a compressed (!) *.iso image from directory tree ?

[Frank Callone]

It started all with an existing *.iso image archive file.

I extracted the content onto my hard disc.

While the original *.iso image file archive has a size of lets say 2000000 bytes the
extracted directory tree has a size of total approx. 3000000 bytes (=50% more).

Now I tried to re-pack the extracted directory tree back into a new *.iso image.
Yes I could do it with some tools. But the resulting *.iso file had always a size
of 3000000 bytes just as the original directory tree.

Unfortunately I did not found a way of creating an *.iso image which is compressed.

How do I create a (maximum) compressed *.iso image file ?

The test operations described above were just test cases to find out the compression ratios.
I planned to apply later the compression + *.iso image process on other different directory trees.

Frank

 

[=?iso-8859-1?Q?_db_=B4=AF`=B7.._=3E=3C=29=29=29=BA]

so what is the problem
you have with windows?


--

<)))º>·´¯`·.¸. , . .·´¯`·.. ><)))º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><)))º>

..

 

[Mikhail Zhilin]

Frank,

That means there are many identical files in the directory tree -- and
this iso-file is not compressed, but optimized.

In the case of the identical files, some of the iso-programs are coding
the content of the identical files only once. Then all the directory
entries of such files, regardless of their amount, names or positions in
the directory tree, are referred to this single location -- saving the
space in the iso-file. But when you extract this image -- all these
files are cloning individually from this single file image.

To create the optimized images, you can try UltraIso,
http://www.ezbsystems.com/ultraiso/index.html (a trial version is
available) -- if to enable the option of optimization (in the image
properties).

Or freeware CdImageGui,
http://www.echip.com.vn/echiproot/Softwares/2004/cdimagegui.zip
that has more user selected options for the image creation -- but
creates the iso-file only of the single complete directory tree (unlike
UltraIso, which can combine several unconnected directories, and delete
or add any individual files in any place of the image directories).

--
Mikhail Zhilin
MS MVP (Windows - Shell/User, 2000..2008)
http://www.aha.ru/~mwz
Sorry, no technical support by e-mail.
Please reply to the newsgroups only.
======

 

[Ace]

Plain vanilla disk images do not utilise compression, they are sector by
sector exact copies of the original.
Compression within a disk image is achieved by referencing duplicate
files within that disk image.
One program capable of this is MagicISO: http://magiciso.com/







(e-mail address removed) (Frank Callone) wrote in

 

[Mikhail Zhilin]

Frank,

That means there are many identical files in the directory tree -- and
this iso-file is not compressed, but optimized.

In the case of the identical files, some of the iso-programs are coding
the content of the identical files only once. Then all the directory
entries of such files, regardless of their amount, names or positions in
the directory tree, are referred to this single location -- saving the
space in the iso-file. But when you extract this image -- all these
files are cloning individually from this single file image.

To create the optimized images, you can try UltraIso,
http://www.ezbsystems.com/ultraiso/index.html (a trial version is
available) -- if to enable the option of optimization (in the image
properties).

Or freeware CdImageGui,
http://www.echip.com.vn/echiproot/Softwares/2004/cdimagegui.zip
that has more user selected options for the image creation -- but
creates the iso-file only of the single complete directory tree (unlike
UltraIso, which can combine several unconnected directories, and delete
or add any individual files in any place of the image directories).

--
Mikhail Zhilin
MS MVP (Windows - Shell/User, 2000..2008)
http://www.aha.ru/~mwz
Sorry, no technical support by e-mail.
Please reply to the newsgroups only.
======