Thanks for your trial.

The source code of fs_wrapper is opened at the following URL.
http://unit.aist.go.jp/itri/knoppix/...er.0.36.tar.gz
The source code to make " split-and-compressed block files" is also opened.
http://unit.aist.go.jp/itri/knoppix/...d5files.tar.gz

They aren't well organized, because they are under construction. Please use them on your risk and have fun!
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The above URL may be useful in providing "split and compressed files" to enable more than one "cloop" file to be included in a DVD burn. It is provided by a Japanese source and is used to produce "Fuse KNOPPIX" as described in IDEAS forum.