hey again,
thanks for the long and very detaild answer.

but how is it possible that my external hd is bootale?

usually sometime when linux (or windows) boot up they find the necessary drivers.
so i thought mabye it is possible to start booting from the knoppix cd and in the middle of the booting to find the hd, or maybe to install linux on small partition in my laptop hd and the rest on the external one

if someone knows that this isn't possible please write me.
I don't have enough hd for both windows and linux in my laptop hd - only 10GB.

thanks again, shimi