@ W.P.Schulz
@ Utu

Thanks you for your propositions. I did not know that the "boot-only_CD" is also a file hidden in the places you kindly indicate me.But why to hide it?

I found also this file on the repository of "Free_fr".

Nevertheless I had not well formulated my "idea" which I attempt to make more clear: "my" goal (somewhat") is to "Never use the CD_DVD_Reader".

Evidently this would not meat the profound project of Mr Knopper who
focalizes on "CD_DVD"...

But concerning ONLY "a Flash_Boot", this cannot affect the real project on "CD_DVD"

My Proposition (if possibl!...):
I think that he is surely able to conceive a unique FILE for booting_ONLY_DIRECTLY on Flash even if one DOES NOT POSSESES a Cd_Dvd_Reader.
The Boot_Only_Cd NEEDS necessarily a CD_DVD_Reader (its name tells us about!).

ADVANTAGEs (if possible!...):
1- Booting on such a Flash (No Cd_Reader!) one may use quasi
"entirely an "iso_file" without installing Knoppix (on Hdd or
Burning).

2- So one can Burn or install when wanted via the "iso_file" used
via the "bootfrom=" cheatcode called AFTER the EVENTUAL
"Boot_Only_Flash"

It is essential to understanding me:
AVOID ENTIRELY ANY CD_DVD_READER.

Because I guess that the CD's and DVD's will disappear relatively "soon".

I hope to have been clear enough.

Best regards

knp