2 Questions (about external HD, and USB flash drives)

[Xx Da Twig xX]

1) Is there a way to seperate my (mini) external HD so that one part is password protected, and one part is not? And can I do the same for a USB flash drive?

2) How do I turn my USB flash drive into a key? So that I need it plugged in to use the computer (laptop)?
like this:
http://www.thetravelinsider.info/roadwarriorcontent/securikey.htm
except free.

 

[IAM_7154]

I use Steganos Safe, its not free but I felt it was worth the price.

 

[Xx Da Twig xX]

I downloaded the shareware, but I can only access C: drive. I can't get into my external HD.