Solved!

German text available on http://www.knoppixforum.de/knoppix-f...on-ide-hd.html

As the result of my posts in the german Knoppix-forum and depending on many tests, that I carried out, based on some good advice, I may summarize:

- First there ist a bug in Knoppix 6.0.1, which ist confirmed by Mr. Knopper himself, which causes Knoppix not to boot from an ext2/3 filesystem on USB-Storage or HDD, and second

- I was completly wrong due to my allegedly existing FAT32-partition on hda7 (see discription above)! There was never a FAT32-filesystem on it, but ever a ext3-system instead! I appologize for that carelessness. (There is a FAT32-System on my USB-BOOTSTICK, not on my HDD...).

I can confirm, that Knoppix 6.0.1 does start / boot from HDD or USB-Storage (if it's recognized by BIOS) from a FAT-filesystem, if at least there is a folder 'Knoppix' (or 'foo'), which contains the kernel 'linux', its initrd 'minirt.gz', the compressed filesystem-image 'KNOPPIX' and the folder 'modules' with its content (due to that item I'm not sure).
That's the real "frugal-installation".

@ hal8000:

Thank you for your efford, but do you mistake me? I don't want a 'regular' installation, like a debian, I did want a 'poor-man's-' or a 'fugal-installation'. Mr. Knopper does not suggest a 'regular' installation, anyway...

I suppose you're wrong with your statement, I wouldt have not installed Knoppix, an USB-device has to be present and the Knoppix-filesystem isn't available: As you can see, Knoppix does boot in the environment described above!

With best regards
Oliver Kosslowski