I have an external USB drive. I have successfully installed 6.1 (2011-07-27) on the external USB drive. And I it doesn't appear to have touched my internal drive (good!)
I previously had done this with 5.3 (?) and used a mkinitrd command and associated cookbook found on a web page (http://www.brunel.ac.uk/~eesridr/extlinux.html) I believe that command puts certain things into a ramdisk, maybe for speedup? I'm not sure what it does. When I try that command under 6.1 I get a warning that it won't override without --force. I didn't do it. Do I want to do it? Things seem to work ok, but I haven't done anything substantial with it yet.
