How to make a bootable USB stick for booting a geli encryptet hard disk?

[Frank J. Beckmann]

Hi,

I plan to encrypt the whole hard drive with geli. That is reaaly well 
documented and every thing went ok. But there is one thing that does not 
work. How do I make a bootable USB stick? I need it because the root 
partition of the hard drive is encrypted too. I tried to make a bootable USB 
stick with sysinstall and also with fdisk. I tried to do it on my new Athlon 
64 board and on and old Pentium III board. The result is always the same: 
When I try to boot from the stick the Athlon 64 always says "invalid slice". 
And the P III always tells my "invalid label". That look like some kind of 
geometry problem. Can anybody help my please? I'm using FreeBSD 6.1-RC.

Sorry if this gets posted twice.
-- 
Bye
Frank