How to format a Debian System?

[Carsten.Wagenseil]

I just started using Debian Linux in rev 2.0. I got the System in a
special issue of the german "CHIP". There was enough info about how to
install the system and the packages, but there is nowhere mentioned how
to format or clean the system. I want to make new installation and it is
a very difficult and longwinded way formating the system with Dos.
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